6.9

CVE-2026-54764: traefik

CVSS: 6.9v4.0MediumAnalyzed
AliasesGHSA-3q9r-p662-5j8mGO-2026-6202
Published 06-07-2026Last modified 07-07-2026
Open JSON

Vulnerability summary

CVE-2026-54764 is a medium (CVSS 6.9) vulnerability in traefik. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.4% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2026:11243-1OPENSUSE-SU-2026:11251-1OPENSUSE-SU-2026:21761-1SUSE-SU-2026:23625-1

Timeline

  1. 06-07-2026
    PublishedVulnerability first disclosed.
  2. 07-07-2026
    Last modifiedVulnerability information updated.

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

0.00 pp

From 0.28% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/traefik/traefik2 products
  • v2< 2.11.51
  • v3< 3.6.22 | ≥ 3.7.0, < 3.7.6
Github.com/traefik1 product
  • traefik≤ 1.7.34 | All versions (No fix recorded)
Traefik1 product
  • traefik< 2.11.51 | ≥ 3.0.0, < 3.6.22 | ≥ 3.7.0, < 3.7.6

3 vendors · 4 products

References

8 links