Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.0, 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. Version 2.2.0 patches the issue.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
go-vikunja vikunja affected
Version Status Constraints
< 2.2.0 affected —

No data.

No data.

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Project Subscriptions

No data.

Advisories
Source ID Title
Github GHSA Github GHSA GHSA-47cr-f226-r4pq Vikunja has a 2FA Bypass via Caldav Basic Auth
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/go-vikunja/vikunja/commit/cdf5d30a425d032f749b78b98b828f25ad882615 cve-icon cve-icon
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-47cr-f226-r4pq cve-icon cve-icon
https://vikunja.io/changelog/vikunja-v2.2.0-was-released cve-icon cve-icon
History

Tue, 24 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 24 Mar 2026 15:45:00 +0000

Type Values Removed Values Added
References

Tue, 24 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Description Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.0, 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. Version 2.2.0 patches the issue.
Title Vikunja has a 2FA Bypass via Caldav Basic Auth
Weaknesses CWE-288
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-24T15:33:55.744Z

Reserved: 2026-03-18T21:23:36.676Z

Link: CVE-2026-33315

cve-icon Vulnrichment

Updated: 2026-03-24T15:33:45.879Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-03-24T15:16:35.227

Modified: 2026-03-24T16:16:32.813

Link: CVE-2026-33315

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses