CVE-2026-76216

HIGH 7.5

Vikunja through 2.4.0 Principal-Type Confusion via LinkSharing

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	go-vikunja
Product	vikunja
Published	Aug 19, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

go-vikunja / vikunja

0 ≤ 2.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2 vulncheck.com: https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing

Credits

🔍 manus-use