CVE-2026-46555

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{"affected": [{"affectedData": [{"product": "whatsapp-mcp", "vendor": "verygoodplugins", "versions": [{"status": "affected", "version": "< 0.2.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:verygoodplugins:whatsapp_mcp_server:*:*:*:*:*:*:*:*", "matchCriteriaId": "32AD7D53-BB8C-4DA9-BE52-E6A9AC5C0985", "versionEndExcluding": "0.2.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "WhatsApp MCP Server is a Model Context Protocol (MCP) server for WhatsApp, enabling Claude to read and send WhatsApp messages. Prior to version 0.2.1, the `whatsapp-bridge` HTTP API listens on `127.0.0.1:8080` without authentication and without Host header validation, and the `/api/send` endpoint accepts an absolute `media_path` parameter without confining it to a safe directory. Combined, these issues allow any local process running as the same user as the bridge to send WhatsApp messages from the paired account without authorization; the same caller to read arbitrary files readable by the user (e.g. SSH private keys, browser session data, source code, dotfiles) and exfiltrate them as WhatsApp document attachments; and/or a remote attacker to trigger the same operations via DNS rebinding from a webpage the user visits, since no Host header validation is performed. In MCP environments, \"local caller\" extends beyond processes the user explicitly launched \u2014 sibling MCP servers, IDE extensions, and tool-triggered flows running in the user's session can act as the effective caller. This issue is fixed in whatsapp-mcp v0.2.1 and corresponding Docker images / release artifacts. Users should upgrade immediately. The fix introduces bearer token authentication on the bridge HTTP API (configured via environment variable, required on all requests, validated with constant-time comparison); host header allow-list validation to prevent DNS rebinding; and confinement of `media_path` to a configured directory, with rejection of absolute paths outside the root and path traversal sequences. This is a breaking change for clients of the bridge API. For users who cannot immediately upgrade: Stop the bridge, or block loopback access to port 8080, when the bridge is not actively in use; avoid running the bridge alongside untrusted MCP servers, browser extensions, or other untrusted local processes; avoid browsing untrusted sites while the bridge is running (DNS rebinding mitigation); and/or run the bridge under a dedicated user account or in a sandbox/container with no access to sensitive files."}, {"lang": "es", "value": "El Servidor MCP de WhatsApp es un servidor de Protocolo de Contexto de Modelo (MCP) para WhatsApp, que permite a Claude leer y enviar mensajes de WhatsApp. Antes de la versi\u00f3n 0.2.1, la API HTTP \u2019whatsapp-bridge\u2019 escucha en \u2019127.0.0.1:8080\u2019 sin autenticaci\u00f3n y sin validaci\u00f3n del encabezado Host, y el endpoint \u2019/api/send\u2019 acepta un par\u00e1metro \u2019media_path\u2019 absoluto sin confinarlo a un directorio seguro. Combinados, estos problemas permiten a cualquier proceso local ejecut\u00e1ndose como el mismo usuario que el puente enviar mensajes de WhatsApp desde la cuenta emparejada sin autorizaci\u00f3n; al mismo llamador leer archivos arbitrarios legibles por el usuario (por ejemplo, claves privadas SSH, datos de sesi\u00f3n del navegador, c\u00f3digo fuente, dotfiles) y exfiltrarlos como archivos adjuntos de documentos de WhatsApp; y/o a un atacante remoto desencadenar las mismas operaciones a trav\u00e9s de la reasignaci\u00f3n de DNS desde una p\u00e1gina web que el usuario visita, ya que no se realiza validaci\u00f3n del encabezado Host. En entornos MCP, \u2019llamador local\u2019 se extiende m\u00e1s all\u00e1 de los procesos que el usuario lanz\u00f3 expl\u00edcitamente - servidores MCP hermanos, extensiones de IDE y flujos activados por herramientas ejecut\u00e1ndose en la sesi\u00f3n del usuario pueden actuar como el llamador efectivo. Este problema est\u00e1 solucionado en whatsapp-mcp v0.2.1 y las im\u00e1genes Docker / artefactos de lanzamiento correspondientes. Los usuarios deben actualizar inmediatamente. La soluci\u00f3n introduce autenticaci\u00f3n con token de portador en la API HTTP del puente (configurada mediante variable de entorno, requerida en todas las solicitudes, validada con comparaci\u00f3n de tiempo constante); validaci\u00f3n de lista de permitidos del encabezado host para prevenir la reasignaci\u00f3n de DNS; y confinamiento de \u2019media_path\u2019 a un directorio configurado, con rechazo de rutas absolutas fuera de la ra\u00edz y secuencias de salto de ruta. Esto es un cambio disruptivo para los clientes de la API del puente. Para los usuarios que no pueden actualizar inmediatamente: Detenga el puente, o bloquee el acceso de bucle invertido al puerto 8080, cuando el puente no est\u00e9 en uso activo; evite ejecutar el puente junto con servidores MCP no confiables, extensiones de navegador u otros procesos locales no confiables; evite navegar por sitios no confiables mientras el puente est\u00e9 en ejecuci\u00f3n (mitigaci\u00f3n de reasignaci\u00f3n de DNS); y/o ejecute el puente bajo una cuenta de usuario dedicada o en un sandbox/contenedor sin acceso a archivos sensibles."}], "id": "CVE-2026-46555", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46555", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-20T17:35:08.494886Z", "version": "2.0.3"}}]}, "published": "2026-07-20T17:17:09.820", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/verygoodplugins/whatsapp-mcp/blob/main/SECURITY.md"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/verygoodplugins/whatsapp-mcp/releases/tag/v0.2.1"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/verygoodplugins/whatsapp-mcp/security/advisories/GHSA-7jj9-4qqq-4xc4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-306"}, {"lang": "en", "value": "CWE-346"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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