CVE-2026-87521: Infoleak
Chromium CVE-2026-87521: Information leak in WebMCP
Other sources
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)
— MITRE
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 153.0.4234.32 - Upgrade
Upgrade
Chromium-based Google Chrometo a version that resolves this vulnerability.Fixed in 153.0.8010.36 - Upgrade
Upgrade
Microsoft Edge (Chromium-based)to a version that resolves this vulnerability.Fixed in 153.0.8010.36
Event History
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.