# Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools

Advisory record · `GHSA-6fg3-hvw7-2fwq`

- **Identifiers:** `GHSA-6fg3-hvw7-2fwq` · `CVE-2025-9611` · `GHSA-8rgw-6xp9-2fg3`
- **State:** Confirmed
- **Severity:** CVSS 7.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-749](https://cwe.mitre.org/data/definitions/749.html)
- **Tags:** [CWE-749](https://agentprime.io/advisories/tag/cwe-749.md)
- **Published:** 7 Jan 2026
- **Updated:** 3 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Jan 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@playwright/mcp` (npm): affected `<0.0.40`; fixed in `0.0.40`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.2 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.012, the 68th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 7 Jan 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-6fg3-hvw7-2fwq](https://github.com/advisories/GHSA-6fg3-hvw7-2fwq)
- [OSV: GHSA-6fg3-hvw7-2fwq](https://osv.dev/vulnerability/GHSA-6fg3-hvw7-2fwq)
- <https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-9611>
- <https://github.com/microsoft/playwright-mcp/issues/1206>
- <https://github.com/microsoft/playwright/commit/1313fbd>
- <https://github.com/microsoft/playwright-mcp>
- <https://msrc.microsoft.com/report/vulnerability/VULN-164412>
- <https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-6fg3-hvw7-2fwq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-6fg3-hvw7-2fwq/>. Everything for agents: <https://agentprime.io/llms.txt>.