EUVD-2026-81301
GHSA-f795-p5jw-j6g2
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Network-reachable and no attacker auth (PR:N), but success depends on obtaining a victim session_id so AC:H; hijacked session grants full read and act-as-victim, so C:H/I:H, A:N.
Primary rating from Vendor (https://github.com/djust-org/djust).
CVSS VectorVendor: https://github.com/djust-org/djust
Lifecycle Timeline
5DescriptionCVE.org
Impact
SSE sessions were keyed solely by a client-chosen session_id with no binding to the authenticated user - a control the WebSocket transport has but that was dropped on SSE. An attacker who learns (or a victim who leaks) a session_id could connect to the message endpoint and dispatch event handlers that execute with the victim's identity and state.
Patches
Fixed in djust 1.0.7. Each SSE session is bound to its owning principal at creation and cross-principal access is rejected; SSE session creation is additionally capped per principal.
Workarounds
Disable the SSE transport short of upgrading.
AnalysisAI
Server-Sent Events (SSE) sessions in djust versions before 1.0.7 are keyed solely by a client-chosen session_id with no binding to the authenticated user, so an unauthenticated remote attacker who learns or is leaked a valid victim session_id can connect to the message endpoint and dispatch event handlers that execute with the victim's identity and state, rated 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N, CWE-384). The WebSocket transport enforces this principal binding but the control was dropped on the SSE path, and obtaining a valid session_id first is the limiting factor that accounts for the high attack complexity despite the absence of an authentication requirement (PR:N). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the djust SSE (Server-Sent Events) transport to be in use - the WebSocket transport is not affected because it binds sessions to the authenticated principal. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Moderate-to-serious but not an emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to djust 1.0.7, the vendor-released patch version, for example via pip install -U 'djust>=1.0.7', which binds each SSE session to its owning principal at creation, rejects cross-principal access, and additionally caps SSE session creation per principal. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every application, container image, and lockfile entry referencing djust below 1.0.7, prioritize any internet-facing SSE endpoint, and where immediate upgrade is not possible restrict the SSE message endpoint at the gateway or network layer to expected clients while enabling verbose logging of session creation and event-handler dispatch to detect cross-principal use. …
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Same weakness CWE-384 – Session Fixation
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External POC / Exploit Code
Leaving vuln.today