{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-118266",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-27T20:13:55.314Z",
        "datePublished": "2026-10-28T19:21:47.729Z",
        "dateUpdated": "2026-10-28T19:21:47.729Z"
    },
    "containers": {
        "cna": {
            "title": "Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-352",
                            "lang": "en",
                            "description": "CWE-352: Cross-Site Request Forgery (CSRF)",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "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"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4"
                },
                {
                    "name": "https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1"
                },
                {
                    "name": "https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af"
                },
                {
                    "name": "https://github.com/labstack/echo/releases/tag/v4.16.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/releases/tag/v4.16.0"
                },
                {
                    "name": "https://github.com/labstack/echo/releases/tag/v5.4.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/releases/tag/v5.4.0"
                }
            ],
            "affected": [
                {
                    "vendor": "labstack",
                    "product": "echo",
                    "versions": [
                        {
                            "version": "< 4.16.0",
                            "status": "affected"
                        },
                        {
                            "version": ">= 5.0.0, < 5.4.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-28T19:21:47.729Z"
            },
            "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."
                }
            ],
            "source": {
                "advisory": "GHSA-r7w9-592q-9vg4",
                "discovery": "UNKNOWN"
            }
        }
    }
}