CVE-2026-87521: Infoleak

Q: What level of access does an attacker need to exploit this issue?

The attacker must already have compromised the Chrome renderer process and then use a crafted HTML page. The data does not indicate that this vulnerability alone provides initial renderer compromise.

Q: What data could be exposed?

A successful exploit could allow access to cross-origin data. The provided information does not identify specific data types or affected origins.

Q: Which Chrome versions should be updated?

Google Chrome versions prior to 153.0.8010.36 are affected according to the provided advisory. Update Chrome to 153.0.8010.36 or later.

Published Sep 9, 2026

Updated

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)

Affected Software

1 affected component

Google Chrome<153.0.8010.36

Event History

Sep 9, 2026

CVE Published

via MITRE·12:09 AM

Data Sourced

via MITRE·12:09 AM

DescriptionWeakness

Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

The attacker must already have compromised the Chrome renderer process and then use a crafted HTML page. The data does not indicate that this vulnerability alone provides initial renderer compromise.

What data could be exposed?

A successful exploit could allow access to cross-origin data. The provided information does not identify specific data types or affected origins.

Which Chrome versions should be updated?

Google Chrome versions prior to 153.0.8010.36 are affected according to the provided advisory. Update Chrome to 153.0.8010.36 or later.