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Vulnerabilities

Security incident · CVE-2025-9611

Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections.

Published Jan 7, 2026 · catalog updated Oct 8, 2026 · Microsoft Playwright

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-9611. EPSS is 1.22%. Act only if a listed version of Microsoft Playwright is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.22%
Remediation
Version ranges on file
Affected products
vendor Microsoft Playwright 0 <0.0.40

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Playwright 0 <0.0.400 <0.0.40

How to fix CVE-2025-9611

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-9611. EPSS is 1.22%. Act only if a listed version of Microsoft Playwright is installed.

Which versions are affected?

Compare what you have installed with Microsoft Playwright 0 <0.0.40 0 <0.0.40. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.22%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 7, 2026 · EUVD

    Detected

    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.

  2. Oct 8, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-9611

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-9611

    30-day exploitation probability 1.22%

    first.org
  • EUVDVulnerability recordEUVD-2026-1179

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 29, 2026
  • FIRST EPSSOct 29, 2026
  • EUVDOct 28, 2026