CVE-2026-85595CWE-287

CVE-2026-85595

Critical · published September 4, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
52.3
In the wild
Unconfirmed
What it is

Traefik versions before v2.11.55 and versions v3.0.0 through v3.7.10 contain an authentication bypass vulnerability in the digestAuth middleware where unknown usernames receive an empty secret instead of rejection. Attackers can compute a valid digest response using the empty secret and arbitrary credentials to bypass authentication on any digestAuth-protected route without a valid username or password.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00692 · 52.3th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-09-04T16:17Z
Affected products (2)
ProductVersionsFixed in
traefik/traefik< 2.11.552.11.55
traefik/traefik≥ 3.0.0, < 3.7.113.7.11
References (2)
https://github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64c · [email protected]https://www.vulncheck.com/advisories/traefik-before-2.11.55-authentication-bypass-via-digestauth · [email protected]
EPSS history
Timeline
  • 06 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 04 SEP 11:29Z
    Traefik before v2.11.55 Authentication Bypass via digestAuth
    cvelistv5