CVE-2025-9611 | BDVDB-2026-309396 Detail

MicrosoftPlaywright

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.

Impact#

Per CVSS v4.0: confidentiality impact low, integrity impact low, availability impact high. Attack vector: network.

Weaknesses#

CWE-749 Exposed Dangerous Method or Function

References#

Exploit#

No public exploit known

History#

Version 12026-01-07Record published in the CVE List.
Version 22026-11-08Most recent update recorded in the CVE List.

Published

Published: 2026-01-07
Last modified: 2026-11-08

Vendor information

Vendor: Microsoft
Product: Playwright

All Microsoft vulnerabilities

Score

7.2 High

EPSS

1.2%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 69.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 0.0.40
Fixed
0.0.40

Scoring System

CVSS v4.0

7.2 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	Passive
Vulnerable System Confidentiality	Low
Vulnerable System Integrity	Low
Vulnerable System Availability	High
Subsequent System Confidentiality	Low
Subsequent System Integrity	Low
Subsequent System Availability	Low

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).