CVE-2026-35051
Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth
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.
INFO
Published Date :
April 30, 2026, 9:16 p.m.
Last Modified :
Nov. 11, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-35051
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Traefik to version 2.11.43 or later.
- Update Traefik to version 3.6.14 or later.
- Update Traefik to version 3.7.0-rc.2 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-35051.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-35051 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-35051
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-35051 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-35051 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Nov. 11, 2026
Action Type Old Value New Value Added Translation Title: Traefik, Description: Traefik es un proxy inverso HTTP y un balanceador de carga. Antes de las versiones 2.11.43, 3.6.14 y 3.7.0-rc.2, existe una vulnerabilidad de omisión de autenticación en el middleware ForwardAuth de Traefik cuando trustForwardHeader=false está configurado y Traefik se despliega detrás de un proxy ascendente de confianza. Este problema ha sido parcheado en las versiones 2.11.43, 3.6.14 y 3.7.0-rc.2. -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:openshift_devspaces:3.28::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces 3.28', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:openshift_devspaces:3.28::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces 3.28', 'versions': [{'status': 'unaffected', 'version': '1779786779', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'devspaces/traefik-rhel9', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:openshift_devspaces:3.28::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces 3.28', 'defaultStatus': 'affected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Added CWE CWE-501 Added Reference https://access.redhat.com/errata/RHSA-2026:21772 Added Reference https://access.redhat.com/security/cve/CVE-2026-35051 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2464235 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35051.json -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-35051', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-01T21:19:58.832533Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'traefik', 'product': 'traefik', 'versions': [{'status': 'affected', 'version': '< 2.11.43'}, {'status': 'affected', 'version': '>= 3.0.0-beta1, < 3.6.14'}, {'status': 'affected', 'version': '>= 3.7.0-ea.1, < 3.7.0-rc.2'}]}] -
Initial Analysis by [email protected]
May. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:* *cpe:2.3:a:traefik:traefik:3.7.0:ea2:*:*:*:*:*:* *cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.43 *cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.6.14 *cpe:2.3:a:traefik:traefik:3.7.0:ea3:*:*:*:*:*:* *cpe:2.3:a:traefik:traefik:3.7.0:rc1:*:*:*:*:*:* Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/releases/tag/v2.11.43 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/releases/tag/v3.6.14 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54 Types: Exploit, Patch, Vendor Advisory -
New CVE Received by [email protected]
Apr. 30, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-345 Added Reference https://github.com/traefik/traefik/releases/tag/v2.11.43 Added Reference https://github.com/traefik/traefik/releases/tag/v3.6.14 Added Reference https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 Added Reference https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54