CVE-2026-118266

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CVE-2026-118266

Summary: Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method

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.

References: https://github.com/labstack/echo/releases/tag/v4.16.0, https://github.com/labstack/echo/releases/tag/v5.4.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118266.json, https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4, https://nvd.nist.gov/vuln/detail/CVE-2026-118266, https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1, https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af