VULNERABILITY INTELLIGENCE

CVE-2026-48020

CVSS score10 CRITICAL
EPSS probability0.78%
CISA KEVNot currently listed
Published2026-06-23
Last modified2026-09-02
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.

Weakness classification

  • security-advisories@github.com: CWE-288
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-22

Primary references