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 via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint...

GO-2026-5881 goshs: Share-link ?token=… redemption races past download limit in goshs.de/goshs

goshs: Share-link ?token=… redemption races past download limit in goshs.de/goshs...

CVE-2026-56768

Vulnerability summary (CVE-2026-56768) Seahub versions before 13.0.23 fail to enforce SHARE_LINK_LOGIN_REQUIRED on GET /api/v2.1/share-link-zip-task/, allowing unauthenticated access when a folder share-link token is present. An attacker can call the GET endpoint to obtain a fileserver zip token ...