{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-48020", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-20T17:44:09.587Z", "datePublished": "2026-06-23T19:10:31.557Z", "dateUpdated": "2026-06-23T19:10:31.557Z"}, "containers": {"cna": {"title": "Traefik StripPrefix Route-Level Auth Bypass via Path Normalization", "problemTypes": [{"descriptions": [{"cweId": "CWE-288", "lang": "en", "description": "CWE-288: Authentication Bypass Using an Alternate Path or Channel", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "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:H/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2"}, {"name": "https://github.com/traefik/traefik/releases/tag/v2.11.48", "tags": ["x_refsource_MISC"], "url": "https://github.com/traefik/traefik/releases/tag/v2.11.48"}, {"name": "https://github.com/traefik/traefik/releases/tag/v3.6.19", "tags": ["x_refsource_MISC"], "url": "https://github.com/traefik/traefik/releases/tag/v3.6.19"}, {"name": "https://github.com/traefik/traefik/releases/tag/v3.7.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/traefik/traefik/releases/tag/v3.7.3"}], "affected": [{"vendor": "traefik", "product": "traefik", "versions": [{"version": ">= 3.7.0-ea.1, < 3.7.3", "status": "affected"}, {"version": ">= 3.0.0-beta1, < 3.6.19", "status": "affected"}, {"version": "< 2.11.48", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-23T19:10:31.557Z"}, "descriptions": [{"lang": "en", "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths \u2014 such as admin or internal configuration endpoints \u2014 without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3."}], "source": {"advisory": "GHSA-xf64-8mw2-4gr2", "discovery": "UNKNOWN"}}}}

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