CVE-2026-102878

mcp-chrome-bridge through 1.0.31 CORS Origin Bypass

8.6 High

mcp-chrome-bridge through 1.0.31 contains an origin validation error in the native-server HTTP API that allows attackers to bypass CORS restrictions. Attackers can craft malicious web pages that make cross-origin requests to the local server and invoke browser automation tools including script execution, page content reading, and screenshot capture.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.80%Up 0.6 points since Sep 30, 2026

What each source reports

CVE List Score used8.6

mcp-chrome-bridge through 1.0.31 CORS Origin Bypass

Record: CVE-2026-102878
CVSS 4.0: 8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness: CWE-346
Updated: 2026-11-02

EUVDEUVD-2026-894138.6

Record: EUVD-2026-89413
CVSS 4.0: 8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-wfc7-pjhg-rg958.6

mcp-chrome-bridge through 1.0.31 contains an origin validation error in the native-server HTTP...

Record: GHSA-wfc7-pjhg-rg95
CVSS 4.0: 8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness: CWE-346
Updated: 2026-11-02

NVD8.6

Record: CVE-2026-102878
CVSS 4.0: 8.6 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness: CWE-346
Updated: 2026-11-02

Affected products

hangwin mcp-chrome-bridge

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	mcp-chrome-bridge (hangwin/mcp-chrome) <= 1.0.31 - CORS Origin Bypass (CSWSH)

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, Nuclei, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-102878 is a high vulnerability (CVSS 8.6) in Hangwin Mcp-chrome-bridge, published September 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. No source names a fixed version.