CVE-2026-91973
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Sep 15, 2026
Vendor
unknown
Description
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.