{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-35051", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-31T21:06:06.429Z", "datePublished": "2026-04-30T20:26:06.716Z", "dateUpdated": "2026-07-15T01:03:12.192Z" }, "containers": { "cna": { "title": "Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-345", "lang": "en", "description": "CWE-345: Insufficient Verification of Data Authenticity", "type": "CWE" } ] } ], "metrics": [ { "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "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", "version": "4.0" } } ], "references": [ { "name": "https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54", "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54" }, { "name": "https://github.com/traefik/traefik/releases/tag/v2.11.43", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/traefik/traefik/releases/tag/v2.11.43" }, { "name": "https://github.com/traefik/traefik/releases/tag/v3.6.14", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/traefik/traefik/releases/tag/v3.6.14" }, { "name": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2" } ], "affected": [ { "vendor": "traefik", "product": "traefik", "versions": [ { "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", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-30T20:26:06.716Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "source": { "advisory": "GHSA-6384-m2mw-rf54", "discovery": "UNKNOWN" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-05-01T21:19:58.832533Z", "id": "CVE-2026-35051", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-01T21:20:11.714Z" } }, { "affected": [ { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:openshift_devspaces:3.28::el9" ], "defaultStatus": "affected", "packageName": "devspaces/traefik-rhel9", "product": "Red Hat OpenShift Dev Spaces 3.28", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1779786779", "versionType": "rpm" } ] } ], "datePublic": "2026-04-30T20:26:06.716Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in Traefik, an HTTP reverse proxy and load balancer. This authentication bypass vulnerability exists in Traefik's ForwardAuth middleware when the `trustForwardHeader` setting is configured as `false` and Traefik is deployed behind a trusted upstream proxy. A remote attacker could exploit this to bypass authentication, potentially gaining unauthorized access to protected resources." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-501", "description": "Trust Boundary Violation", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-35051" }, { "name": "RHBZ#2464235", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464235" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35051.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:21772" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:21772: Red Hat OpenShift Dev Spaces 3.28" } ], "timeline": [ { "lang": "en", "time": "2026-04-30T21:01:28.437Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-04-30T20:26:06.716Z", "value": "Made public." } ], "title": "Traefik: github.com/traefik/traefik: Traefik: Authentication bypass in ForwardAuth middleware", "workarounds": [ { "lang": "en", "value": "To mitigate this issue, ensure that the `trustForwardHeader` setting in Traefik's ForwardAuth middleware is not explicitly configured as `false` unless absolutely necessary. If Traefik is deployed behind a trusted upstream proxy, review the configuration to ensure that `trustForwardHeader` is either set to `true` or omitted, allowing Traefik to correctly process forwarded headers for authentication. If this configuration is modified, a restart or reload of the Traefik service may be required for the changes to take effect." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:03:12.192Z" } } ] } }