{"id":"CVE-2026-65600","state":"PUBLISHED","title":"Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex","description":"Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex \"^/api(.*)\", replacement \"/$1\"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.","publishedAt":"2026-07-22T11:21:46.783Z","updatedAt":"2026-10-08T15:23:54.243Z","severity":{"score":7.8,"label":"High","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["traefik traefik"],"affected":[{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v2","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.11.52","versionType":"semver"},{"version":"2.11.52","status":"unaffected","versionType":"semver"}]},{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v3","defaultStatus":"unaffected","versions":[{"version":"3.6.0","status":"affected","lessThan":"3.6.23","versionType":"semver"},{"version":"3.6.23","status":"unaffected","versionType":"semver"}]},{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v3","defaultStatus":"unaffected","versions":[{"version":"3.7.0","status":"affected","lessThan":"3.7.7","versionType":"semver"},{"version":"3.7.7","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv","https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/65xxx/CVE-2026-65600.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-65600","state":"PUBLISHED","datePublished":"2026-07-22T11:21:46.783Z","dateUpdated":"2026-10-08T15:23:54.243Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-07-22T10:48:36.000Z"},"containers":{"cna":{"title":"Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex","descriptions":[{"lang":"en","value":"Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex \"^/api(.*)\", replacement \"/$1\"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7."}],"affected":[{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v2","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.11.52","versionType":"semver"},{"version":"2.11.52","status":"unaffected","versionType":"semver"}]},{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v3","defaultStatus":"unaffected","versions":[{"version":"3.6.0","status":"affected","lessThan":"3.6.23","versionType":"semver"},{"version":"3.6.23","status":"unaffected","versionType":"semver"}]},{"vendor":"traefik","product":"traefik","packageURL":"pkg:golang/github.com/traefik/traefik/v3","defaultStatus":"unaffected","versions":[{"version":"3.7.0","status":"affected","lessThan":"3.7.7","versionType":"semver"},{"version":"3.7.7","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv","name":"GitHub Security Advisory (GHSA-cxjq-mrr5-89rv)","tags":["vendor-advisory"]},{"url":"https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex","name":"VulnCheck Advisory: Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","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","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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-08T15:23:54.243Z"},"datePublic":"2026-07-09T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionEndExcluding":"2.11.52"},{"vulnerable":true,"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionStartIncluding":"3.6.0","versionEndExcluding":"3.6.23"},{"vulnerable":true,"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7.0","versionEndExcluding":"3.7.7"}]}]}],"credits":[{"lang":"en","value":"C-h4ck-0","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-23T19:08:10.643487Z","id":"CVE-2026-65600","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-23T19:08:19.233Z"}}]}}}