CVE-2026-91981

MEDIUMCVSS 4.3

Description

Vikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint.

Timeline

Published:September 15th, 2026 4:17 PM

Last modified:September 21st, 2026 7:17 PM

CVSS Scoring

CVSS v3: 4.3 (MEDIUM)

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

Weaknesses (CWE)

CWE-200

References & Reports

Advisories, patches, and third-party reports

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjr
https://www.vulncheck.com/advisories/vikunja-before-2.6.0-user-enumeration-via-v2-api
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjr

Source: NIST NVD · Data may lag official sources by up to one minute