Review reviewHigh

CVE-2026-35051

traefik traefik, Red Hat OpenShift Dev Spaces 3.28

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.

CVSS: 7.8
EPSS: 0.27%
CISA KEV: Not listed
Published: 2026.05.01

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.27%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: traefik traefik, Red Hat OpenShift Dev Spaces 3.28
Affected versions: >= < 2.11.43, >= >= 3.0.0-beta1, < 3.6.14, >= >= 3.7.0-ea.1, < 3.7.0-rc.2, < 2.11.43, >= 3.0.0 < 3.6.14, 3.7.0
Fixed versions: 2.11.43, 3.6.14

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that traefik traefik, Red Hat OpenShift Dev Spaces 3.28 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: 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
CWE: CWE-345, CWE-501