by Kastro
Paper/Archive/CVE-2026-34727

CVE-2026-34727

go-vikunja vikunja — Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path

EPSS 0.3%public exploitCVSS 9.1
critical.is priorityof 100
41
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 20.6.206 × 204.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
vikunja< 2.3.0–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg