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Vulnerability record · CVE-2026-34727 · published 10 April 2026

CVE-2026-34727: Vikunja improper authentication vulnerability

Vikunja · Vikunja

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.

9.1 CVSS 3.1 Critical EPSS 0.42% · top 66.4% CWE-287 · Improper authentication
9.1CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg ExploitVendor Advisory
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-34727), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.