CVE-2026-48020 (GCVE-0-2026-48020)

Vulnerability from cvelistv5 – Published: 2026-06-23 19:10 – Updated: 2026-06-24 13:37
VLAI
Title
Traefik StripPrefix Route-Level Auth Bypass via Path Normalization
Summary
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.
Severity
7.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
Impacted products
Vendor Product Version
traefik traefik Affected: >= 3.7.0-ea.1, < 3.7.3
Affected: >= 3.0.0-beta1, < 3.6.19
Affected: < 2.11.48
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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