CVE-2026-91981 — Vikunja before 2.6.0 User Enumeration via v2 API
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 …
Published: 2026-09-15 · CVSS: 5.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7