This advisory has been withdrawn because it is a duplicate of GHSA-vfxw-3x8p-2vjr. This link is maintained to preserve external references.
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.
{
"cwe_ids": [
"CWE-200"
],
"github_reviewed": true,
"github_reviewed_at": "2026-10-09T20:52:33Z",
"nvd_published_at": "2026-09-15T16:17:55Z",
"severity": "MODERATE"
}