EUVD-2026-21414
GHSA-8jvc-mcx6-r4cg
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
5DescriptionGitHub Advisory
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.
AnalysisAI
Authentication bypass in Vikunja task management platform allows unauthenticated attackers to circumvent two-factor authentication when OIDC email-based user matching is enabled. The OIDC callback handler issues complete JWT tokens without validating TOTP enrollment status, enabling full account access to users with configured TOTP protection when matched through OIDC email fallback. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Vikunja versions prior to 2.3.0 with OIDC authentication enabled and a local user account having TOTP two-factor authentication enrolled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.4 reflects high-impact authentication bypass: unauthenticated attackers can bypass TOTP by exploiting OIDC email matching, gaining full account access without second-factor verification. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Attacker with target email address registers/authenticates via OIDC provider, triggering email-based user matching. OIDC callback issues full JWT without TOTP validation, granting instant account access regardless of enrolled 2FA. … |
| Remediation | Vendor-released patch: Upgrade to Vikunja 2.3.0 immediately to resolve authentication bypass. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: audit Vikunja deployment to confirm OIDC and TOTP are both enabled and identify affected user accounts. …
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External POC / Exploit Code
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