vulnerability / NVI-00008982 / Revision 1
Vikunja: WebSocket authentication ignores server-side session state, so revoked sessions keep receiving live pushes
GitHub lists this reviewed advisory for code.vikunja.io/api. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
6.5 medium
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
code.vikunja.io/api
source listed>= 2.3.0, <= 2.6.0
### Summary Vikunja v2.6.0 introduced server-side sessions with revocation semantics: `DELETE /api/v2/user/sessions/{id}` documents "Revokes a specific session by its UUID", and enabling TOTP calls `DeleteAllUserSessions` to invalidate all sessions. The WebSocket endpoint accepts any cryptographically valid user JWT without ever resolving its `sid` (session id) claim against the sessions table. A connection authenticated before revocation stays authenticated and continues to receive live pushes indefinitely, and even brand-new WebSocket connections are accepted with a token whose session was deleted. The revocation feature therefore does not cover the WebSocket boundary at all. ### Details User access JWTs carry a session reference: `NewUserJWTAuthtoken` (`pkg/modules/auth/auth.go:188`) sets `claims["sid"] = sessionID`, and the API login-session documentation describes the claim as tying the JWT to a server-side session. On the HTTP side nothing consumes the claim per request either (REST access tokens simply expire after their short TTL, a design the maintainers documented when fixing GHSA-96q5, and refresh tokens are correctly invalidated when the session row is deleted). The
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-4hv6-xc92-j86g ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.