CVE-2026-76216
Vikunja through 2.4.0 Principal-Type Confusion via LinkSharing
- State
- Published
- Severity
- 7.7 High
- Published
- Aug 19, 2026
- Updated
- Aug 20, 2026
- Reserved
- Aug 19, 2026
Description
Vikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
vikunjago-vikunja |
|
References
- GitHub Security Advisory (GHSA-32r8-5843-4qw2)vendor-advisory
- VulnCheck Advisory: Vikunja through 2.4.0 Principal-Type Confusion via LinkSharingthird-party-advisory
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