{"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":"high","cvss":7.2,"cvssVector":"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","cwe":["CWE-749"],"vendor":"Microsoft","product":"Playwright","affected":["Playwright < 0.0.40"],"published":"2026-01-07","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:16:54.920","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","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-01-07T14:24:21.005462Z"},"cvssSource":"cna","epss":0.01222,"epssPercentile":0.68571,"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":"midnight","depthScore":52,"depthScoreParts":{"impact":39.6,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[{"seq":218102,"id":"CVE-2025-9611","ts":1791478376716,"field":"exploit_available","old":"false","new":"true"},{"seq":218101,"id":"CVE-2025-9611","ts":1791478376716,"field":"cvss","old":null,"new":"7.2"},{"seq":218100,"id":"CVE-2025-9611","ts":1791478376716,"field":"severity","old":"none","new":"high"}]}