CVE-2026-34727 Details
Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the OIDC callback handler issues a full JWT token without checking whether the matched user has TOTP two-factor authentication enabled. When a local user with TOTP enrolled is matched via the OIDC email fallback mechanism, the second factor is completely skipped. This vulnerability is fixed in 2.3.0.
A vulnerability in Vikunja's OIDC callback handler prior to version 2.3.0 allows users with TOTP two-factor authentication enabled to bypass the second-factor requirement. The issue arises because the callback handler issues a full JWT token without verifying if the user has TOTP enabled. When a local user with TOTP enrolled is matched through the OIDC email fallback, the TOTP verification is completely ignored, granting access without the necessary authentication challenge.
Users should update to Vikunja version 2.3.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg | CISA-ADP | ExploitVendor Advisory |
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vikunja vikunja | < 2.3.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 20, 2026 | Initial Analysis | [email protected] |
| Apr 13, 2026 | CVE Modified | CISA-ADP |
| Apr 10, 2026 | New CVE Received | [email protected] |