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CVE-2026-55557

CVE-2026-55557 · browse-mcp: Arbitrary file write via unconfined download and state paths

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browse-mcp is a Playwright-based headless-browser MCP server for MCP-capable agents. Prior to 0.8.2, browser_download writes a fetched response body to join(save_dir, filename) without validating the caller-controlled save_dir, while browser_save_state and browser_load_state honor a caller-controlled path unchanged. A malicious MCP client, or an autonomous agent steered by indirect prompt injection on a visited page, can choose an arbitrary save_dir or state path and a URL whose response body becomes attacker-controlled file contents, allowing writes to any path the process can reach, including ~/.bashrc, autostart entries, or cron files, and potentially leading to host code execution. The force_fetch fallback also uses a raw fetch() that bypasses the BROWSE_MCP_ALLOWED_ORIGINS origin fence. This issue is fixed in version 0.8.2.

CVSS 8.6 · Hoch · EPSS 0,2% · Korrektur verfügbar

Veröffentlicht
Aktualisiert

Technologie-Stack: node

Betroffene Produkte und Versionen

  • browse-mcp

    Softwareversionen
    • < 0.8.2: Betroffen

    Keine Korrektur veröffentlicht

  • browse-mcp npm

    Betroffene Versionsbereiche
    • SEMVER: < 0.8.2

    Auf 0.8.2 aktualisieren

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