CVE-2026-33315: Vikunja has a 2FA Bypass via Caldav Basic Auth

March 20, 2026

The Caldav endpoint allows login using Basic Authentication, which in turn allows users to bypass the TOTP on 2FA-enabled accounts. The user can then access standard project information that would normally be protected behind 2FA (if enabled), such as project name, description, etc.

References

github.com/advisories/GHSA-47cr-f226-r4pq
github.com/go-vikunja/vikunja
github.com/go-vikunja/vikunja/commit/cdf5d30a425d032f749b78b98b828f25ad882615
github.com/go-vikunja/vikunja/security/advisories/GHSA-47cr-f226-r4pq
nvd.nist.gov/vuln/detail/CVE-2026-33315

Code Behaviors & Features

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