CVE search · CVE-2026-88011
CVE-2026-88011
medium 5.3
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until 3.7.12, a client-supplied dot-form header such as X.Authenticated.User survives ForwardAuth replacement and underscoreHeadersStrategy because Go treats it as distinct from X-Authenticated-User while normalization-prone CGI, WSGI, PHP, and NGINX backends collapse both names. A backend can consequently consume the client value instead of the identity Traefik asserted, allowing identity spoofing for any header managed by Traefik. The aliasHeadersStrategy protection is disabled by default and must be configured as delete or reject. The mitigation is available in 2.11.56 and 3.7.12.
Details
- Status
- Analyzed
- Published
- Last changed
- Source
- security-advisories@github.com
- Weakness
- CWE-290
Severity
| Version | Score | Vector | Source |
|---|---|---|---|
| CVSS 4.0 | medium 5.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
security-advisories@github.comSecondary |
| CVSS 3.1 | high 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
nvd@nist.govPrimary |
Affected products
Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.
- traefik · traefik
References
- https://github.com/traefik/traefik/commit/0331801c72329e0eaeb850e53ccce87c57fbecf8Patch
- https://github.com/traefik/traefik/pull/13720Issue TrackingPatch
- https://github.com/traefik/traefik/releases/tag/v2.11.56Release Notes
- https://github.com/traefik/traefik/releases/tag/v3.7.12Release Notes
- https://github.com/traefik/traefik/security/advisories/GHSA-rf44-j88r-hh8cPatchVendor Advisory