CVE-2026-91972CWE-307

CVE-2026-91972

High · published September 15, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
49.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00633 · 49.4th percentile
Weakness
CWE-307 · Improper Restriction of Excessive Authentication Attempts
Published
2026-09-15T20:17Z
References (3)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q · [email protected]https://www.vulncheck.com/advisories/vikunja-before-2.6.0-authentication-bypass-via-unthrottled-api · [email protected]https://github.com/go-vikunja/vikunja/security/advisories/GHSA-6rvj-qwjf-3m4q · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    Vikunja before 2.6.0 Authentication Bypass via Unthrottled API
    cvelistv5