Vulnerability in Go-Vikunja Vikunja
CVE-2026-91972
Vikunja versions before 2.6.0 fail to apply rate limiting to /api/v2 public authentication endpoints including login, register, password-reset, and OAuth token routes. Remote unauthenticated attackers can perform unbounded credential guessing, account enumeration, and password-reset flooding attacks without throttling restrictions.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-unt… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91972?
- CVE-2026-91972 is a high-severity vulnerability in Go-Vikunja Vikunja, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.5/10. Published 2026-09-15.
- How severe is CVE-2026-91972?
- High severity. CVSS v3 base score is 7.5 out of 10.