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CVE-2025-54135

Estado: AnalizadaCrítica (9.8)—

Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Editor web expuesto (Cursor) con inyección indirecta en prompt que permite crear archivos sin aprobación (CWE-78) y ejecutar código remoto mediante .cursor/mcp.json manipulado (CVSS AV:N/PR:N).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementVulnerability ScanningRestrict Web-Based ContentRestrict File and Directory PermissionsRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

Anysphere — Cursor

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-54135",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-54135",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-08-05T13:58:32.369007Z"
        }
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 1.8
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        "type": "Primary",
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      "affectedData": [
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          "vendor": "cursor",
          "product": "cursor",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.3.9"
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  "published": "2025-08-05T01:15:41.410",
  "references": [
    {
      "url": "https://github.com/cursor/cursor/security/advisories/GHSA-4cxx-hrm3-49rm",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
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  ],
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  "weaknesses": [
    {
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      "source": "security-advisories@github.com",
      "description": [
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          "value": "CWE-78"
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        {
          "lang": "en",
          "value": "CWE-829"
        }
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  "descriptions": [
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      "lang": "en",
      "value": "Cursor is a code editor built for programming with AI. Cursor allows writing in-workspace files with no user approval in versions below 1.3.9, If the file is a dotfile, editing it requires approval but creating a new one doesn't. Hence, if sensitive MCP files, such as the .cursor/mcp.json file don't already exist in the workspace, an attacker can chain a indirect prompt injection vulnerability to hijack the context to write to the settings file and trigger RCE on the victim without user approval. This is fixed in version 1.3.9."
    },
    {
      "lang": "es",
      "value": "Cursor es un editor de código diseñado para programar con IA. En versiones anteriores a la 1.3.9, Cursor permite escribir archivos en el espacio de trabajo sin la aprobación del usuario. Si el archivo es un archivo de puntos, editarlo requiere aprobación, pero crear uno nuevo no. Por lo tanto, si no existen archivos MCP sensibles, como el archivo .cursor/mcp.json, en el espacio de trabajo, un atacante puede encadenar una vulnerabilidad de inyección indirecta de solicitud para secuestrar el contexto y escribir en el archivo de configuración, lo que activará una RCE en la víctima sin la aprobación del usuario. Esto se corrigió en la versión 1.3.9."
    }
  ],
  "lastModified": "2026-06-17T09:39:30.873",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:anysphere:cursor:*:*:*:*:*:*:*:*",
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