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CVE-2026-35051

Traefik authentication bypass

10.0 CRITICALPublic exploitEPSS 0.31%
  1. Published30 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Traefik≥ 3.0.0 < 3.6.14 · < 2.11.43 · 3.7.0

Remediation

Fixed in
Traefik≥ 3.6.14

References

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Frequently asked

Is CVE-2026-35051 being actively exploited?

CVE-2026-35051 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.31%.

How severe is CVE-2026-35051?

CVE-2026-35051 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.31% probability of exploitation.

Which products are affected by CVE-2026-35051?

Affected products include Traefik.

How do I fix CVE-2026-35051?

Upgrade affected software to a fixed version, for example Traefik 3.6.14 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-35051 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.