CVE-2026-91981
MEDIUM
NVD
CVSS Score
4.3
Severity
MEDIUM
Published
Sep 15, 2026
Vendor
unknown
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.