Openwebui

CVE	Summary	Severity	CVSS	EPSS	Priority	Signals
CVE-2026-88000	Denial-of-service in Open WebUI versions 0.10.0 through 0.11.0 allows any authenticated user to permanently block all server-side request processing by submitting a cyclic chat message tree and then triggering the message-deletion endpoint. The DELETE /api/v1/chats/{id}/messages/{message_id} API delegates to a Python helper that traverses childrenIds in a while loop without recording visited node identifiers, entering an infinite loop that occupies the server's request thread indefinitely until the process is forcibly killed. No active exploitation or KEV listing is recorded, but the attack requires only a valid user session and no special configuration, making it a credible insider or compromised-credential threat for any multi-user deployment. Vendor-released patch is available in version 0.11.1.	MEDIUM	6.5	0.3%	53	PoC
CVE-2026-88002	Infinite-loop denial-of-service in Open WebUI 0.5.0-0.11.0 allows any authenticated user to permanently crash the backend service by storing id-less messages in a cyclic parent chain. The flaw in `get_message_list` (backend/open_webui/utils/misc.py) caused the chat-history traversal to never terminate, blocking the async event loop and consuming memory until the process died - with the condition persisting across restarts until an operator manually removes the offending messages or upgrades. No public exploit or active exploitation has been identified, but the low barrier (any login) and persistence across restarts make this an operationally impactful issue for self-hosted deployments.	MEDIUM	6.5	0.3%	53	PoC
CVE-2026-59222	Information disclosure in Open WebUI versions 0.7.0 through 0.9.x allows authenticated channel members to retrieve sensitive administrator settings, including API keys for tool servers and webhook configurations. The /api/v1/channels/{id}/members endpoint fails to sanitize user model responses, exposing full UserModel data to any participant in a shared channel. A public proof-of-concept exists, but active exploitation is not confirmed and the EPSS probability of widespread exploitation is low (0.26%).	MEDIUM	6.0	0.3%	50	PoC
CVE-2026-59216	Cross-user remote code execution in Open WebUI before 0.10.0 lets an authenticated user run arbitrary code interpreter Python or invoke tools inside another logged-in user's session. The get_event_call handler dispatched execute:python and execute:tool Socket.IO events to any client-supplied session_id that was merely 'connected', so an attacker who harvested a victim's socket ID via the ydoc:document:join collaboration flow could hijack that session. A proof-of-concept is indicated in the SSVC data, though the flaw is not in CISA KEV and EPSS rates near-term mass exploitation low (0.28%, 19th percentile).	CRITICAL	9.0	0.3%	45	PoC
CVE-2026-88001	SSRF filter-bypass in Open WebUI 0.9.5-0.11.0 allows authenticated users to route server-side fetches to private networks, loopback addresses, and cloud metadata endpoints by exploiting unvalidated HTTP redirect destinations. When AIOHTTP_CLIENT_ALLOW_REDIRECTS is enabled, the platform applies WEB_FETCH_FILTER_LIST and private-address controls only to the initial request URL, not to redirect hops - allowing a crafted redirect chain to reach AWS IMDS, Azure platform channels, or internal services. No public exploit exists and the issue is not in CISA KEV, but the scope-changed CVSS vector (S:C) and potential exposure of cloud IAM credentials in hosted deployments elevate practical risk above the 5.0 base score.	MEDIUM	5.0	0.3%	45	PoC
CVE-2026-59224	Identity spoofing in Open WebUI before 0.10.0 lets an authenticated low-privileged user impersonate another account by injecting query parameters into the terminal WebSocket URL. Because backend/open_webui/routers/terminals.py built the ws_terminal upstream URL from an unencoded session_id and appended user_id as a query parameter - while the HTTP proxy path trusted an integrity-unbound X-User-Id header - an attacker can make the terminal backend resolve a different user identity, gaining that victim's terminal session context. No public exploit has been identified at time of analysis, but the fix is confirmed in v0.10.0 and the flaw is scored CVSS 8.0.	HIGH	8.0	0.3%	40
CVE-2026-59221	Path traversal in Open WebUI's terminal proxy (versions 0.9.6 through 0.9.x, fixed in 0.10.0) lets an authenticated attacker reach files and resources outside the intended proxy scope. The _sanitize_proxy_path routine in backend/open_webui/routers/terminals.py decoded incoming proxy paths exactly eight times, so a nine-times percent-encoded ../ sequence survived normalization and was decoded a final time by the upstream terminal server, defeating the traversal check. No public exploit or CISA KEV listing exists at time of analysis, but the scope-changing CVSS 3.1 score of 7.7 (S:C/C:H) signals meaningful confidentiality impact on the backend terminal component.	HIGH	7.7	0.4%	38
CVE-2026-59219	Session revocation bypass in Open WebUI 0.9.0 through 0.9.x (deployments configured with Redis) lets a holder of a revoked JWT keep authenticating realtime Socket.IO connections. The flaw stems from first-message authentication for Socket.IO connect, user-join, join-channels, join-note, and the terminal websocket calling decode_token without the Redis-backed is_valid_token revocation check, so logout, forced-logout, or token invalidation does not sever active realtime access. No public exploit is identified at time of analysis and it is not listed in CISA KEV; the fix is version 0.10.0.	HIGH	7.1	0.2%	36	PoC
CVE-2026-28788	Open WebUI versions prior to 0.8.6 permit authenticated users to overwrite arbitrary file contents through an insecure batch processing endpoint, escalating read-only knowledge base access to write permissions without ownership validation. Attackers with low-level privileges can manipulate RAG (Retrieval-Augmented Generation) content served to language models, poisoning AI responses delivered to other users. CVSS 7.1 (High) reflects network-accessible exploitation with low complexity requiring only standard user authentication; no public exploit identified at time of analysis.	HIGH	7.1	0.0%	36
CVE-2026-59225	Open WebUI versions 0.8.12 through 0.9.x expose a missing authorization flaw that permits authenticated non-admin users to reach restricted underlying AI models by exploiting a code-path divergence in task endpoints. The standard chat route (/api/v1/chat/completions) correctly re-validates submodel access after arena wrapper resolution, but task endpoints such as /api/v1/tasks/moa/completions call utils.chat.generate_chat_completion() directly, triggering arena fallback resolution after the wrapper check passes and recursing with bypass_filter=True - effectively nullifying the submodel access control. No public exploit has been identified and the vulnerability is not listed in CISA KEV, but the attack requires only low-privilege authentication (PR:L), making it directly relevant to any multi-tenant or enterprise Open WebUI deployment with model access tiering.	MEDIUM	6.3	0.2%	32	PoC
CVE-2026-59212	Incorrect authorization in Open WebUI versions 0.9.6 through 0.9.x allows authenticated users with read-only knowledge file access to escalate their privileges to file write or delete operations. The root cause is that `_verify_knowledge_file_access` validated only read permissions, while write and delete routes independently trusted access derived from writable model `meta.knowledge` entries - creating a logical gap where the authorization check and the actual enforcement were misaligned. No public exploit or CISA KEV listing is identified at time of analysis; this is a medium-severity, authenticated-only issue fixed in v0.10.0.	MEDIUM	5.4	0.3%	27	PoC
CVE-2026-29070	Open WebUI versions prior to 0.8.6 allow authenticated users to delete arbitrary files from knowledge bases they have write access to, due to missing validation that files actually belong to the target knowledge base. An attacker with legitimate write permissions to any knowledge base can exploit this to delete files from other knowledge bases by crafting requests with known file identifiers, resulting in data loss and service disruption. No public exploit code or active exploitation has been reported at time of analysis.	MEDIUM	5.4	0.0%	27
CVE-2026-59213	Cache key misconfiguration in Open WebUI versions 0.6.27 through 0.9.x leaks permission-filtered model lists across authenticated users during the aiocache TTL window. The flaw exists in both the OpenAI and Ollama router handlers, where a lambda was incorrectly passed as the cache key instead of a per-user key_builder, collapsing all users into a single shared cache entry. An authenticated attacker on a shared instance can receive a different user's model list - revealing which AI models that user has access to - with no public exploit identified at time of analysis and a vendor-released patch available in v0.10.0.	MEDIUM	5.0	0.3%	25	PoC
CVE-2026-59217	File upload authorization bypass in Open WebUI before 0.10.0 allows authenticated users with read-only knowledge base access to inject arbitrary files into restricted knowledge bases by supplying a crafted metadata.knowledge_id parameter. The upload endpoint omits the write-access check enforced by the dedicated /api/v1/knowledge/<id>/file/add route (CWE-862), creating a privilege escalation path for any authenticated platform user. No public exploit code or CISA KEV listing exists at time of analysis, but the impact extends beyond the low CVSS integrity score - injected content directly influences LLM responses for all users of the affected knowledge base, enabling indirect prompt injection.	MEDIUM	4.3	0.3%	22
CVE-2026-59223	Open WebUI's WEB_FETCH_FILTER_LIST blocklist enforcement fails to parse hostnames at label boundaries in versions prior to 0.10.0, enabling authenticated users to bypass administrator-configured host restrictions and trigger server-side fetches to internally restricted resources. Two bypass classes exist: embedding a blocked hostname in the URL path component (e.g., https://attacker.com/internal.corp/data) rather than the authority, and using a sibling domain sharing the blocked entry's suffix (e.g., evilinternalhost.example.com matching a blocklist entry for internalhost.example.com). No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.	MEDIUM	4.3	0.2%	22

CVE-2026-88000

Denial-of-service in Open WebUI versions 0.10.0 through 0.11.0 allows any authenticated user to permanently block all server-side request processing by submitting a cyclic chat message tree and then triggering the message-deletion endpoint. The DELETE /api/v1/chats/{id}/messages/{message_id} API delegates to a Python helper that traverses childrenIds in a while loop without recording visited node identifiers, entering an infinite loop that occupies the server's request thread indefinitely until the process is forcibly killed. No active exploitation or KEV listing is recorded, but the attack requires only a valid user session and no special configuration, making it a credible insider or compromised-credential threat for any multi-user deployment. Vendor-released patch is available in version 0.11.1.

MEDIUM

6.5

0.3%

53

PoC

CVE-2026-88002

Infinite-loop denial-of-service in Open WebUI 0.5.0-0.11.0 allows any authenticated user to permanently crash the backend service by storing id-less messages in a cyclic parent chain. The flaw in `get_message_list` (backend/open_webui/utils/misc.py) caused the chat-history traversal to never terminate, blocking the async event loop and consuming memory until the process died - with the condition persisting across restarts until an operator manually removes the offending messages or upgrades. No public exploit or active exploitation has been identified, but the low barrier (any login) and persistence across restarts make this an operationally impactful issue for self-hosted deployments.

MEDIUM

6.5

0.3%

53

PoC

CVE-2026-59222

Information disclosure in Open WebUI versions 0.7.0 through 0.9.x allows authenticated channel members to retrieve sensitive administrator settings, including API keys for tool servers and webhook configurations. The /api/v1/channels/{id}/members endpoint fails to sanitize user model responses, exposing full UserModel data to any participant in a shared channel. A public proof-of-concept exists, but active exploitation is not confirmed and the EPSS probability of widespread exploitation is low (0.26%).

MEDIUM

6.0

0.3%

50

PoC

CVE-2026-59216

Cross-user remote code execution in Open WebUI before 0.10.0 lets an authenticated user run arbitrary code interpreter Python or invoke tools inside another logged-in user's session. The get_event_call handler dispatched execute:python and execute:tool Socket.IO events to any client-supplied session_id that was merely 'connected', so an attacker who harvested a victim's socket ID via the ydoc:document:join collaboration flow could hijack that session. A proof-of-concept is indicated in the SSVC data, though the flaw is not in CISA KEV and EPSS rates near-term mass exploitation low (0.28%, 19th percentile).

CRITICAL

9.0

0.3%

45

PoC

CVE-2026-88001

SSRF filter-bypass in Open WebUI 0.9.5-0.11.0 allows authenticated users to route server-side fetches to private networks, loopback addresses, and cloud metadata endpoints by exploiting unvalidated HTTP redirect destinations. When AIOHTTP_CLIENT_ALLOW_REDIRECTS is enabled, the platform applies WEB_FETCH_FILTER_LIST and private-address controls only to the initial request URL, not to redirect hops - allowing a crafted redirect chain to reach AWS IMDS, Azure platform channels, or internal services. No public exploit exists and the issue is not in CISA KEV, but the scope-changed CVSS vector (S:C) and potential exposure of cloud IAM credentials in hosted deployments elevate practical risk above the 5.0 base score.

MEDIUM

5.0

0.3%

45

PoC

CVE-2026-59224

Identity spoofing in Open WebUI before 0.10.0 lets an authenticated low-privileged user impersonate another account by injecting query parameters into the terminal WebSocket URL. Because backend/open_webui/routers/terminals.py built the ws_terminal upstream URL from an unencoded session_id and appended user_id as a query parameter - while the HTTP proxy path trusted an integrity-unbound X-User-Id header - an attacker can make the terminal backend resolve a different user identity, gaining that victim's terminal session context. No public exploit has been identified at time of analysis, but the fix is confirmed in v0.10.0 and the flaw is scored CVSS 8.0.

HIGH

8.0

0.3%

40

CVE-2026-59221

Path traversal in Open WebUI's terminal proxy (versions 0.9.6 through 0.9.x, fixed in 0.10.0) lets an authenticated attacker reach files and resources outside the intended proxy scope. The _sanitize_proxy_path routine in backend/open_webui/routers/terminals.py decoded incoming proxy paths exactly eight times, so a nine-times percent-encoded ../ sequence survived normalization and was decoded a final time by the upstream terminal server, defeating the traversal check. No public exploit or CISA KEV listing exists at time of analysis, but the scope-changing CVSS 3.1 score of 7.7 (S:C/C:H) signals meaningful confidentiality impact on the backend terminal component.

HIGH

7.7

0.4%

38

CVE-2026-59219

Session revocation bypass in Open WebUI 0.9.0 through 0.9.x (deployments configured with Redis) lets a holder of a revoked JWT keep authenticating realtime Socket.IO connections. The flaw stems from first-message authentication for Socket.IO connect, user-join, join-channels, join-note, and the terminal websocket calling decode_token without the Redis-backed is_valid_token revocation check, so logout, forced-logout, or token invalidation does not sever active realtime access. No public exploit is identified at time of analysis and it is not listed in CISA KEV; the fix is version 0.10.0.

HIGH

7.1

0.2%

36

PoC

CVE-2026-28788

Open WebUI versions prior to 0.8.6 permit authenticated users to overwrite arbitrary file contents through an insecure batch processing endpoint, escalating read-only knowledge base access to write permissions without ownership validation. Attackers with low-level privileges can manipulate RAG (Retrieval-Augmented Generation) content served to language models, poisoning AI responses delivered to other users. CVSS 7.1 (High) reflects network-accessible exploitation with low complexity requiring only standard user authentication; no public exploit identified at time of analysis.

HIGH

7.1

0.0%

36

CVE-2026-59225

Open WebUI versions 0.8.12 through 0.9.x expose a missing authorization flaw that permits authenticated non-admin users to reach restricted underlying AI models by exploiting a code-path divergence in task endpoints. The standard chat route (/api/v1/chat/completions) correctly re-validates submodel access after arena wrapper resolution, but task endpoints such as /api/v1/tasks/moa/completions call utils.chat.generate_chat_completion() directly, triggering arena fallback resolution after the wrapper check passes and recursing with bypass_filter=True - effectively nullifying the submodel access control. No public exploit has been identified and the vulnerability is not listed in CISA KEV, but the attack requires only low-privilege authentication (PR:L), making it directly relevant to any multi-tenant or enterprise Open WebUI deployment with model access tiering.

MEDIUM

6.3

0.2%

32

PoC

CVE-2026-59212

Incorrect authorization in Open WebUI versions 0.9.6 through 0.9.x allows authenticated users with read-only knowledge file access to escalate their privileges to file write or delete operations. The root cause is that `_verify_knowledge_file_access` validated only read permissions, while write and delete routes independently trusted access derived from writable model `meta.knowledge` entries - creating a logical gap where the authorization check and the actual enforcement were misaligned. No public exploit or CISA KEV listing is identified at time of analysis; this is a medium-severity, authenticated-only issue fixed in v0.10.0.

MEDIUM

5.4

0.3%

27

PoC

CVE-2026-29070

Open WebUI versions prior to 0.8.6 allow authenticated users to delete arbitrary files from knowledge bases they have write access to, due to missing validation that files actually belong to the target knowledge base. An attacker with legitimate write permissions to any knowledge base can exploit this to delete files from other knowledge bases by crafting requests with known file identifiers, resulting in data loss and service disruption. No public exploit code or active exploitation has been reported at time of analysis.

MEDIUM

5.4

0.0%

27

CVE-2026-59213

Cache key misconfiguration in Open WebUI versions 0.6.27 through 0.9.x leaks permission-filtered model lists across authenticated users during the aiocache TTL window. The flaw exists in both the OpenAI and Ollama router handlers, where a lambda was incorrectly passed as the cache key instead of a per-user key_builder, collapsing all users into a single shared cache entry. An authenticated attacker on a shared instance can receive a different user's model list - revealing which AI models that user has access to - with no public exploit identified at time of analysis and a vendor-released patch available in v0.10.0.

MEDIUM

5.0

0.3%

25

PoC

CVE-2026-59217

File upload authorization bypass in Open WebUI before 0.10.0 allows authenticated users with read-only knowledge base access to inject arbitrary files into restricted knowledge bases by supplying a crafted metadata.knowledge_id parameter. The upload endpoint omits the write-access check enforced by the dedicated /api/v1/knowledge/<id>/file/add route (CWE-862), creating a privilege escalation path for any authenticated platform user. No public exploit code or CISA KEV listing exists at time of analysis, but the impact extends beyond the low CVSS integrity score - injected content directly influences LLM responses for all users of the affected knowledge base, enabling indirect prompt injection.

MEDIUM

4.3

0.3%

22

CVE-2026-59223

Open WebUI's WEB_FETCH_FILTER_LIST blocklist enforcement fails to parse hostnames at label boundaries in versions prior to 0.10.0, enabling authenticated users to bypass administrator-configured host restrictions and trigger server-side fetches to internally restricted resources. Two bypass classes exist: embedding a blocked hostname in the URL path component (e.g., https://attacker.com/internal.corp/data) rather than the authority, and using a sibling domain sharing the blocked entry's suffix (e.g., evilinternalhost.example.com matching a blocklist entry for internalhost.example.com). No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.

MEDIUM

4.3

0.2%

22

Severity Breakdown

Monthly CVE Trend

Affected Products (6)

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