Description
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Affected products
traefik: traefik
References8
- github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-r… ExploitPatchVendor Advisory
- github.com/traefik/traefik/releases/tag/v2.11.43 ProductRelease Notes
- github.com/traefik/traefik/releases/tag/v3.6.14 ProductRelease Notes
- github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 ProductRelease Notes
- access.redhat.com/errata/RHSA-2026:21772
- access.redhat.com/security/cve/CVE-2026-35051
- bugzilla.redhat.com/show_bug.cgi?id=2464235
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35051…
Metrics
- CVSS 3.1
-
10.0
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N - CVSS 4.0
-
7.8
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/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 - EPSS — exploit probability
- 0% percentile: 19 · as of 13 November 2026
- CWE
- CWE-345CWE-501
Could this be exploited in your environment?
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