CVE-2026-55557
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
browse-mcp prior to 0.8.2 writes fetched response bodies to a caller-controlled save_dir without validation, while browser_save_state and browser_load_state honor a caller-controlled path unchanged. A malicious MCP client or an agent steered by indirect prompt injection can write files to any path the process can reach, including ~/.bashrc, autostart entries, or cron files, potentially leading to host code execution. This issue is fixed in version 0.8.2.
Risk Assessment
An attacker could write malicious files to critical system locations, potentially leading to host takeover or persistent security compromise.
Recommendation
It is recommended to upgrade browse-mcp to version 0.8.2. Also, restrict process privileges and avoid using untrusted MCP clients.
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Original NVD description (English source)
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.

