Information leak in WebMCP in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to obtain… (CVE-2026-87521)
An information leak vulnerability exists in the WebMCP component of Google Chrome versions prior to 153.0.8010.36. This flaw allows a remote attacker who has already compromised the renderer process to obtain cross-origin data by using a crafted HTML page. The vulnerability is classified with medium severity by Chromium security.
AI Analysis
Technical Summary
CVE-2026-87521 is an information leak vulnerability in the WebMCP component of Google Chrome before version 153.0.8010.36. It permits a remote attacker, who has compromised the renderer process, to extract cross-origin data through a specially crafted HTML page. This vulnerability is categorized under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). No CVSS score or detailed exploit information is provided, and no known exploits are reported in the wild.
Potential Impact
The vulnerability allows unauthorized disclosure of cross-origin data if the attacker has control over the renderer process. This could lead to leakage of sensitive information from other origins within the browser context.
Mitigation Recommendations
A fix is available in Google Chrome version 153.0.8010.36 and later. Users and administrators should update to this version or newer to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying the browser update.
Information leak in WebMCP in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to obtain… (CVE-2026-87521)
Description
An information leak vulnerability exists in the WebMCP component of Google Chrome versions prior to 153.0.8010.36. This flaw allows a remote attacker who has already compromised the renderer process to obtain cross-origin data by using a crafted HTML page. The vulnerability is classified with medium severity by Chromium security.
Affected software
pkg:github/chromium/chromiumRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-87521 is an information leak vulnerability in the WebMCP component of Google Chrome before version 153.0.8010.36. It permits a remote attacker, who has compromised the renderer process, to extract cross-origin data through a specially crafted HTML page. This vulnerability is categorized under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). No CVSS score or detailed exploit information is provided, and no known exploits are reported in the wild.
Potential Impact
The vulnerability allows unauthorized disclosure of cross-origin data if the attacker has control over the renderer process. This could lead to leakage of sensitive information from other origins within the browser context.
Mitigation Recommendations
A fix is available in Google Chrome version 153.0.8010.36 and later. Users and administrators should update to this version or newer to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying the browser update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-cxvg-jqm2-2qpv
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-87521"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6aa15f95acd9273b49618ded
Added to database: 09/09/2026, 13:31:01 UTC
Last enriched: 09/09/2026, 14:15:59 UTC
Last updated: 09/10/2026, 01:52:00 UTC
Views: 6
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