{"id":"CVE-2026-118266","state":"PUBLISHED","title":"Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method","description":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's MethodOverride middleware accepts a safe HTTP method as the override target for a POST request. When MethodOverride is registered before CSRF in the post-routing middleware chain, route selection retains the original state-changing POST handler but the override changes the method before CSRF evaluates it, causing both token validation and Sec-Fetch-Site checks to be skipped. A cross-site exploit requires an authenticated victim and an override value that a browser-submitted request can control, such as the form getter used by the advisory reproducer; the default X-HTTP-Method-Override header getter is not settable by a cross-site form. This issue is fixed in 4.16.0 and 5.4.0.","publishedAt":"2026-10-28T19:21:47.729Z","updatedAt":"2026-10-28T19:21:47.729Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["labstack echo"],"affected":[{"vendor":"labstack","product":"echo","versions":[{"version":"< 4.16.0","status":"affected"},{"version":">= 5.0.0, < 5.4.0","status":"affected"}]}],"references":["https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4","https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","https://github.com/labstack/echo/releases/tag/v4.16.0","https://github.com/labstack/echo/releases/tag/v5.4.0"],"weaknesses":["CWE-352"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118266.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118266","state":"PUBLISHED","datePublished":"2026-10-28T19:21:47.729Z","dateUpdated":"2026-10-28T19:21:47.729Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-27T20:13:55.314Z"},"containers":{"cna":{"title":"Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method","descriptions":[{"lang":"en","value":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's MethodOverride middleware accepts a safe HTTP method as the override target for a POST request. When MethodOverride is registered before CSRF in the post-routing middleware chain, route selection retains the original state-changing POST handler but the override changes the method before CSRF evaluates it, causing both token validation and Sec-Fetch-Site checks to be skipped. A cross-site exploit requires an authenticated victim and an override value that a browser-submitted request can control, such as the form getter used by the advisory reproducer; the default X-HTTP-Method-Override header getter is not settable by a cross-site form. This issue is fixed in 4.16.0 and 5.4.0."}],"affected":[{"vendor":"labstack","product":"echo","versions":[{"version":"< 4.16.0","status":"affected"},{"version":">= 5.0.0, < 5.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4","name":"https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","name":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","name":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/releases/tag/v4.16.0","name":"https://github.com/labstack/echo/releases/tag/v4.16.0","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/releases/tag/v5.4.0","name":"https://github.com/labstack/echo/releases/tag/v5.4.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-352","lang":"en","description":"CWE-352: Cross-Site Request Forgery (CSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-28T19:21:47.729Z"},"source":{"advisory":"GHSA-r7w9-592q-9vg4","discovery":"UNKNOWN"}}}}}