Description
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 a locally running MCP server, resulting in unintended invocation of MCP tool endpoints.
References (3)
Core 3
Core References
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation
Vendor Advisory technical-description
exploit
https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3
Scores
CVSS v4
7.2
EPSS
0.0084
EPSS Percentile
53.0%
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
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-749
Status
published
Products (2)
Microsoft/Playwright
< 0.0.40
playwright/mcp
0 - 0.0.40npm
Published
Jan 07, 2026
Tracked Since
Feb 18, 2026