Echo has CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method

影響: go:github.com/labstack/echo/v5 >= 5.0.0, < 5.4.0 → 5.4.0, go:github.com/labstack/echo/v4 < 4.16.0 → 4.16.0

The MethodOverride middleware accepts any non-empty string as the override target method — including safe methods (GET, HEAD, OPTIONS, TRACE) — when rewriting a POST request. When MethodOverride is registered before CSRF in the post-routing middleware chain (e.Use()), it rewrites the request method to a safe method before CSRF evaluates it. The CSRF middleware then skips token validation for the now-safe method, allowing state-changing POST handlers to execute without any CSRF check. Both the l…

GitHub Advisory Databaseで読む

2026/10/29 04:53、GitHub Advisory Databaseが「Echo has CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「警告」(medium) です。関連する技術: Go、GitHub。CVE: CVE-2026-118266。