CVE-2026-34727 json
Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path
published 2026-04-10 6 mo ago modified 2026-10-26 14 d ago also EUVD-2026-21414 , GHSA-8jvc-mcx6-r4cg , GO-2026-5258
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go code.vikunja.io/api 2.3.0
- vikunja vikunja 2.3.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
- github.com/go-vikunja/vikunja@b642b2a commit
- github.com/go-vikunja/vikunja#2582 pull request
- github.com/go-vikunja/vikunja/releases/tag/v2.3.0 release
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 6 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <2.3.0 all versions |
2.3.0 |
Affected products
- go-vikunja vikunja
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/go-vikunja/vikunja/pull/2582
web
-
github.com
/go-vikunja/vikunja/commit/b642b2a4536a3846e627a78dce2fdd1be425e6a1
web
-
github.com
/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg
exploit, web, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-34727
advisory
-
github.com
/go-vikunja/vikunja
package
-
github.com
/go-vikunja/vikunja/releases/tag/v2.3.0
web
Sources
- CVE List CVE-2026-34727
- GitHub Advisory GHSA-8jvc-mcx6-r4cg
- NVD CVE-2026-34727
- OSV GO-2026-5258
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.