Is CVE-2026-54763 actively exploited?

No active exploitation of CVE-2026-54763 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54763 be exploited remotely?

Yes. CVE-2026-54763 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54763?

CVE-2026-54763 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2026-54763

CWE-178Published: July 6, 2026· Updated: Jul 8, 2026

10.0

CVSS v3.1

EPSS:0.26%probability of exploitation in 30 daysPercentile:16.9th

Official Description

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.

NVD Source

Risk Analysis

This critical vulnerability in Traefik allows attackers to spoof identity or authorization context by injecting underscore-variant headers. With a perfect CVSS score of 10.0, this flaw poses an extremely severe risk to the confidentiality and integrity of systems using Traefik's authentication middlewares.

No public exploit is currently known for this vulnerability. Its remote exploitability (AV:N) and low attack complexity indicate that it could be easily exploited if a working exploit were to be developed.

Recommended Action

Users of Traefik should upgrade to versions v2.11.51, v3.6.22, or v3.7.6 to fix this header stripping bypass vulnerability.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-54763 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.