CVE-2025-9611High· 7.2▾ MidnightPoC available

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

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 …

▾ Midnight zone — Critical, or high with PoC / in-the-wild

Depth score52/ 100 · Moderate

impact 39.6 · likelihood 0.2 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

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Published

Jan 7, 2026

Updated

Oct 8, 2026

CVSS

7.2

Vendor

Microsoft

Product

Playwright

CWE

CWE-749

Depth score

52 · Moderate

EPSS

1.2% · p69

Platforms

—

Source

NVD

Vector

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

decided 2026-01-07

Exploitation: poc
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Jul 31.

1.1% → 1.2%▲ 0.07%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

7 events · 275 days

Jan 7, 2026Published
Disclosed via NVD
Jul 31, 2026EPSS first tracked
1.1%
Sep 7, 2026EPSS peak
1.1% → 1.2%
Oct 8, 2026Record revised
Last analysed / modified upstream
Oct 8, 2026Public exploit observed
Exploit / PoC code exists
Oct 8, 2026CVSS changed
— → 7.2
Oct 8, 2026Severity changed
none → high

Microsoft CWE-749 #nvd #cve.org #exploit-available

Affected

Playwright < 0.0.40

Full technical detail▾

Overview

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 8, 2026Public exploit / PoC published
Oct 8, 2026CVSS — → 7.2
Oct 8, 2026Severity none → high

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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