CVE-2026-76216
7.7
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| go-vikunja | vikunja | 0 <= 2.4.0 | affected |
Weaknesses
- CWE-639: Authorization Bypass Through User-Controlled Key
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2
- https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing
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