CVE-2026-91981Vikunja before 2.6.0 User Enumeration via v2 API
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Vikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint.
- CVSS
- 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-200
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
go-vikunja vikunja go_vikunja:vikunja (from the name) | before 2.6.0; 2.6.0 not affected | CNA record |
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vfxw-3x8p-2vjrvendor-advisory
- https://www.vulncheck.com/advisories/vikunja-before-2.6.0-user-enumeration-via-v2-apithird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.