{"id":"CVE-2025-9611","title":"Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections","summary":"Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections. This allows an attacker to perform a DNS rebinding attack via a victim’s web browser and send unauthorized requests to …","severity":"none","cwe":["CWE-749"],"published":"2026-01-07","updated":"2026-07-14","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-9611","references":[{"url":"https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3","label":"disclosure@vulncheck.com"},{"url":"https://github.com/microsoft/playwright/commit/1313fbd","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.0124,"epssPercentile":0.67359,"ingestedAt":"2026-07-15T13:44:03.756Z","slug":"CVE-2025-9611","body":"## Overview\n\nMicrosoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections. This allows an attacker to perform a DNS rebinding attack via a victim’s web browser and send unauthorized requests to a locally running MCP server, resulting in unintended invocation of MCP tool endpoints.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}