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.
History

Wed, 19 Aug 2026 14:15:00 +0000

Type Values Removed Values Added
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.
Title Vikunja through 2.4.0 Principal-Type Confusion via LinkSharing
First Time appeared Vikunja
Vikunja vikunja
Weaknesses CWE-639
CPEs cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*
Vendors & Products Vikunja
Vikunja vikunja
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.7, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-20T16:10:29.192Z

Reserved: 2026-08-19T11:35:13.689Z

Link: CVE-2026-76216

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-19T14:17:47.743

Modified: 2026-08-20T17:19:42.243

Link: CVE-2026-76216

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T16:45:16Z