CVE-2026-87521
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Information Leak in WebMCP in Google Chrome

Publication date: 2026-09-09

Last updated on: 2026-09-09

Assigner: Chrome

Description
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 cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

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Meta Information

Published
2026-09-09
Last Modified
2026-09-09
Generated
2026-09-29
AI Q&A
2026-09-09
EPSS Evaluated
2026-09-27
NVD
CVE-2026-87521
EUVD
EUVD-2026-74351

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
google chrome to 153.0.8010.36 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

This vulnerability is an information leak in WebMCP within Google Chrome before version 153.0.8010.36. A remote attacker who compromised the renderer process could exploit it to access cross-origin data by using a specially crafted HTML page.

Detection Guidance

This vulnerability is specific to Google Chrome and cannot be directly detected via general network or system commands. Ensure your Chrome browser is updated to version 153.0.8010.36 or later to mitigate the risk.

Impact Analysis

If you use an affected version of Chrome, an attacker could steal sensitive data from other websites you visit, even if those sites are protected by same-origin policies. This could include personal information, login credentials, or other confidential data.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, potentially violating GDPR's data protection requirements or HIPAA's privacy rules if protected health information is leaked. Organizations may face compliance penalties if user data is compromised.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later to address the vulnerability.

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