CVE-2026-118266

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{"bugzilla": {"description": "github.com/labstack/echo: Echo: CSRF protection bypass via MethodOverride safe method rewriting", "id": "2563162", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563162"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-807", "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.", "A flaw was found in Echo. This vulnerability allows a remote attacker to bypass Cross-Site Request Forgery (CSRF) protections when the MethodOverride middleware is positioned before CSRF validation in the request chain. By tricking an authenticated user into submitting a crafted request that rewrites a state-changing POST request to a safe HTTP method, the application bypasses CSRF checks while still processing the underlying operation. As a result, an attacker can execute unauthorized state-changing actions on behalf of the victim."], "name": "CVE-2026-118266", "public_date": "2026-10-28T19:21:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118266\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118266\nhttps://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1\nhttps://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af\nhttps://github.com/labstack/echo/releases/tag/v4.16.0\nhttps://github.com/labstack/echo/releases/tag/v5.4.0\nhttps://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4"], "statement": "This vulnerability is rated as having a Moderate impact because successful exploitation requires user interaction and depends on non-default middleware configurations to trigger state modifications. Echo applications are only susceptible if the MethodOverride middleware precedes CSRF checks in post-routing and relies on form or query inputs that an external site can manipulate. Furthermore, applications using the default header-based method override remain protected against standard cross-site browser submissions.", "threat_severity": "Moderate"}

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