browse-mcp: Arbitrary file write via unconfined download and state paths
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| That1Drifter | browse-mcp | affected |
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| Vendor | Product | Versions | ||||||||
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| That1drifter | Browse-mcp |
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| Source | ID | Title |
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Github GHSA |
GHSA-m9mq-7m7q-xc6p | browse-mcp has an arbitrary file write via unconfined download and state paths |
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.238% probability within 30 days)
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| First Time appeared |
That1drifter
That1drifter browse-mcp |
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| Vendors & Products |
That1drifter
That1drifter browse-mcp |
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| Metrics |
ssvc
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| Description | 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. | |
| Title | browse-mcp: Arbitrary file write via unconfined download and state paths | |
| Weaknesses | CWE-22 | |
| References |
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| Metrics |
cvssV4_0
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