Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

CVE-2026-34727Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path

High 7.4

In plain English

A high-severity improper authentication in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.3%top 79.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.3.0	GHSA-8jvc-mcx6-r4cg
Go	code.vikunja.io/api	no fix listed	GO-2026-5258

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	< 2.3.0

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

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