CVE-2026-102878 json
mcp-chrome-bridge through 1.0.31 CORS Origin Bypass
published last mo. modified last mo. also EUVD-2026-89413
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
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Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- last mo.
Exploit prediction
0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- Nuclei template mcp-chrome-bridge (hangwin/mcp-chrome) <= 1.0.31 - CORS Origin Bypass (CSWSH) nuclei detection template
- github.com https://github.com/hangwin/mcp-chrome/issues/384 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.6 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| CNA | 4.0 | 8.6 | CVSS: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 |
Affected products
- hangwin mcp-chrome-bridge
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
github.com
/hangwin/mcp-chrome/issues/384
issue-tracking, exploit
-
github.com
/hangwin/mcp-chrome/blob/v1.0.0/app/native-server/src/server/index.ts
technical-description
-
github.com
/hangwin/mcp-chrome
product
-
vulncheck.com
/advisories/mcp-chrome-bridge-through-1.0.31-cors-origin-bypass
third-party-advisory
Sources
- CVE List CVE-2026-102878
- NVD CVE-2026-102878
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.