Api: Duplicate Advisory: Vikunja: Link-share principal-type confusion enables cross-account team removal, bot takeover, and roster disclosure
Description
Vikunja versions up to 2.4.0 have a principal-type confusion vulnerability where link-share principals are incorrectly treated as user principals during permission checks. This allows attackers with a link-share JWT to remove users from teams, delete bot users, and read team rosters due to ID collisions. The vulnerability has a high severity with a CVSS score of 7.5. This advisory is a duplicate and references GHSA-32r8-5843-4qw2. No patch links are provided, and no known exploits are reported in the wild.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Vikunja through version 2.4.0 contains a principal-type confusion vulnerability (CWE-639) where link-share principals with a given ID are treated as user principals with the same ID in three permission checks that lack type guards. This flaw allows attackers possessing a link-share JWT to exploit ID collisions in the autoincrement space to remove victims from teams, enumerate and delete victim bot users, and read team rosters. The vulnerability has a CVSS 3.1 score of 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker with a link-share JWT can abuse the principal-type confusion to remove legitimate users from teams, delete bot users, and access team rosters. This compromises team membership integrity, bot user availability, and confidentiality of team membership information. The vulnerability affects confidentiality, integrity, and availability at a high level.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory GHSA-32r8-5843-4qw2 for current remediation guidance. No official fix or patch links are provided in this advisory. Until a patch is available, restrict link-share JWT distribution and monitor for suspicious activity related to team membership and bot user management.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-9xwc-vwww-qqmw
- Osv Schema Version
- 1.4.0
- Ecosystems
- ["Go"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6ac96e502cdf04f65689a760
Added to database: 10/09/2026, 22:44:32 UTC
Last enriched: 10/09/2026, 22:49:30 UTC
Last updated: 10/09/2026, 22:49:30 UTC
Views: 5
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