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CVE-2026-91819

MISP: HTTP Method Override Bypasses CSRF and Form Validation in BetterSecurityComponent

CVSS 4.0 6.9 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91819

Published

Affected versions of MISP rely on CakePHP request-method override processing in a way that can disable CSRF and form-security validation. CakePHP honors a _method field or X-HTTP-Method-Override header by rewriting the effective request method. For override values outside the normal write verbs POST, PUT, PATCH, and DELETE, CakePHP also clears the parsed request body. MISP’s security component then determines whether to perform _validatePost() and _validateCsrf() based on whether request data remains. With a value such as: _method=GET the body becomes empty before those checks run, so both protections are skipped. A cross-site form containing only that override can therefore reach actions whose parameters are taken from the URL rather than the request body Version affected: ≤2.5.45

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91819

Published

MISP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "modules": [
                        "app/Controller/Component/BetterSecurityComponent.php"
                    ],
                    "product": "MISP",
                    "programFiles": [
                        "app/Controller/Component/BetterSecurityComponent.php"
                    ],
                    "repo": "https://github.com/MISP/MISP",
                    "vendor": "MISP",
                    "versions": [
                        {
                            "lessThan": "2.5.46",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON