Security Advisory

CVE-2026-91973

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-15 15:18:23

Last updated 2026-09-15 15:55:04

Assigner VulnCheck

CVSS score 8.7

State PUBLISHED

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.

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