CVE-2026-87608: High severity Google Chrome vulnerability
Chromium CVE-2026-87608: Improper certificate validation in FedCM
Other sources
Improper certificate validation in FedCM in Google Chrome prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to bypass web origin policy via crafted network traffic. (Chromium security severity: Low)
— 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 (Google Chrome / Microsoft Edge Chromium-based)to a version that resolves this vulnerability.Fixed in 153.0.8010.36 - Compensating control
Mitigate exposure by reducing the likelihood of successful social engineering (e.g., avoid interacting with untrusted sites that could trigger FedCM flows) until browsers are updated to 153.0.8010.36 or later.
Event History
Frequently Asked Questions
What does an attacker need to exploit this issue?
The attacker must use crafted network traffic and leverage social engineering. The issue is described as enabling a bypass of the web origin policy through improper certificate validation in FedCM.
Which Chrome versions should be remediated?
Google Chrome versions prior to 153.0.8010.36 are affected. Update affected installations to 153.0.8010.36 or later.