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.
Severity (CVSS)
| Base score | 7.8 |
|---|---|
| Severity | High |
| Version | CVSS 4.0 |
| Vector | 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 |
| Provided by | CNA |
Weaknesses
- CWE-288 — CWE-288: Authentication Bypass Using an Alternate Path or Channel
Affected products
| Vendor | Product | Versions |
|---|---|---|
| traefik | traefik | >= 3.7.0-ea.1, < 3.7.3; >= 3.0.0-beta1, < 3.6.19; < 2.11.48 |
References
- https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2 (x_refsource_CONFIRM)
- https://github.com/traefik/traefik/releases/tag/v2.11.48 (x_refsource_MISC)
- https://github.com/traefik/traefik/releases/tag/v3.6.19 (x_refsource_MISC)
- https://github.com/traefik/traefik/releases/tag/v3.7.3 (x_refsource_MISC)
Generated from the official CVE List on 24 Jun 2026 09:35 UTC.