{"id":"CVE-2026-118266","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-118266","summary":"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…","details":"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.","published":"2026-10-28T20:17:21.577","modified":"2026-10-28T20:17:21.577","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","label":"labstack/echo@b838391"},"references":[{"type":"WEB","url":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1"},{"type":"WEB","url":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af"},{"type":"WEB","url":"https://github.com/labstack/echo/releases/tag/v4.16.0"},{"type":"WEB","url":"https://github.com/labstack/echo/releases/tag/v5.4.0"},{"type":"WEB","url":"https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T20:17:21.577"}}