CVE-2026-87550
Analyzed Analyzed - Analysis Complete

Improper Output Encoding in Google Chrome

Publication date: 2026-09-09

Last updated on: 2026-09-09

Assigner: Chrome

Description
Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially bypass web origin policy 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-2026-87550
EUVD
EUVD-2026-74396

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-116 The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

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Executive Summary

This vulnerability involves improper encoding or escaping of output in CSS within Google Chrome before version 153.0.8010.36. A remote attacker could exploit this to bypass web origin policy by using a specially crafted HTML page.

Detection Guidance

Detection typically involves checking the installed version of Google Chrome against the patched version (153.0.8010.36 or later). Use commands like 'google-chrome --version' or check via package managers (e.g., 'apt list --installed | grep chrome' on Debian/Ubuntu).

Monitor network traffic for suspicious HTML pages attempting to exploit the vulnerability, though automated detection may require specialized tools.

Impact Analysis

An attacker could potentially access or manipulate content from different websites, leading to data leaks or unauthorized actions on your behalf if you visit a malicious page.

Compliance Impact

This vulnerability involves improper output encoding in Chrome, which could allow an attacker to bypass web origin policy. While it does not directly impact GDPR or HIPAA compliance, such vulnerabilities may lead to unauthorized data access or disclosure, potentially violating privacy requirements under these regulations if exploited.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later immediately. Disable automatic updates temporarily if needed, but prioritize patching.

Restrict untrusted HTML content execution in browsers via enterprise policies or extensions until updates are applied.

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