CVE-2026-91981

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.

CVSS Vector

References

• 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