Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
References
| Link | Resource |
|---|---|
| https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b | Patch |
| https://github.com/traefik/traefik/pull/13262 | Issue Tracking |
| https://github.com/traefik/traefik/security/advisories/GHSA-x677-9fxg-v5c5 | Patch Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
08 Jul 2026, 03:03
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b - Patch | |
| References | () https://github.com/traefik/traefik/pull/13262 - Issue Tracking | |
| References | () https://github.com/traefik/traefik/security/advisories/GHSA-x677-9fxg-v5c5 - Patch, Vendor Advisory | |
| First Time |
Traefik
Traefik traefik |
|
| CPE | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 10.0 |
06 Jul 2026, 21:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-06 21:16
Updated : 2026-07-08 20:16
NVD link : CVE-2026-54763
Mitre link : CVE-2026-54763
CVE.ORG link : CVE-2026-54763
JSON object : View
Products Affected
traefik
- traefik