HIGH 8.7 NVD
CVE-2026-91973
Vikunja before 2.6.0 contains an authentication bypass vulnerability in CalDAV BasicAuth endpoints that lack rate limiting protection. Remote unauthenticated at
Vikunja 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.
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m469-88xx-8rx2
- https://www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-caldav
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m469-88xx-8rx2
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-09-15 via NVD.
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