{"id":"GHSA-p2vv-wrh8-x466","title":"Duplicate Advisory: Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords","summary":"Duplicate Advisory: Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords","severity":"high","cvss":7.5,"cwe":["CWE-307"],"vendor":"api","product":"code.vikunja.io/api","ecosystem":"go","affected":["code.vikunja.io/api <= 2.5.0"],"published":"2026-09-15","updated":"2026-10-09","sourceUpdated":"2026-10-09T20:51:58Z","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-p2vv-wrh8-x466","references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m469-88xx-8rx2"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91973"},{"url":"https://www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-caldav-basicauth"},{"url":"https://github.com/advisories/GHSA-p2vv-wrh8-x466"}],"tags":["ghsa","go"],"ingestedAt":"2026-10-09T21:12:42.330Z","slug":"GHSA-p2vv-wrh8-x466","body":"## Overview\n\n### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-m469-88xx-8rx2. This link is maintained to preserve external references.\n\n### Original Description\nVikunja before 2.6.0 contains an authentication bypass vulnerability in CalDAV BasicAuth endpoints that lack rate limiting protection. Remote unauthenticated attackers can issue unbounded credential-guessing requests against /dav, /.well-known, and /feeds routes to bypass the instance's anti-brute-force controls and compromise password-only accounts.\n\n## Affected packages\n\n- `code.vikunja.io/api <= 2.5.0`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}