EUVD-2026-42629Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
AV:N for web API access, AC:H for TTL timing dependency, PR:L for authenticated-only exploitation, S:C because cross-user data crosses trust boundaries, C:L for model list metadata only.
Primary rating from Vendor (github).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionNVD
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 before 0.10.0, get_all_models handlers in routers/openai.py and routers/ollama.py passed a lambda to aiocache key instead of key_builder, causing permission-filtered per-user model lists to share a static cache entry and exposing one user’s model list to another caller during the TTL window. This issue is fixed in version 0.10.0.
AnalysisAI
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session (PR:L) on an Open WebUI instance running versions 0.6.27 to 0.9.x. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is low-to-moderate for multi-tenant deployments and negligible for single-user or homogeneous-permission instances. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated user on a shared Open WebUI instance sends a GET request to the model list endpoint immediately after another user has populated the shared cache entry. Because the cache key is static rather than user-scoped, the attacker's response contains the victim's permission-filtered model list, revealing which AI models (potentially privileged or restricted) the victim is authorized to use. … |
| Remediation | Vendor-released patch: v0.10.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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