high7.5
CVE-2026-91973
Vikunja before 2.6.0 contains an authentication bypass vulnerability in CalDAV BasicAuth endpoints that lack rate limiting protection.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <= 2.5.0 | 2.6.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-m469-88xx-8rx2
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-m469-88xx-8rx2
- https://nvd.nist.gov/vuln/detail/CVE-2026-91973
- https://github.com/go-vikunja/vikunja/pull/3688
- https://github.com/go-vikunja/vikunja/releases/tag/v2.6.0
- https://www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-caldav-basicauth