CVE-2026-91973
Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-307 |
| Vendor | go-vikunja |
| Product | vikunja |
| Published | Sep 15, 2026 |
| Last Updated | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
go-vikunja / vikunja
0 < 2.6.0
References
Credits
🔍 JellowBeanz26