CVE-2026-87543: Medium severity Google Google Chrome vulnerability
Chromium CVE-2026-87543: Missing authorization in Core
Other sources
Missing authorization in Core in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Low)
— NVD
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
Google Chrome (Chromium-based)to a version that resolves this vulnerability.Fixed in 153.0.8010.36 - Compensating control
Ensure site isolation is enforced by the browser (note: the issue is bypassing site isolation only after a compromised renderer process via a crafted HTML page).
Event History
Frequently Asked Questions
What access does an attacker need before exploiting this issue?
The attacker must already have compromised the Chrome renderer process. The issue is then exploitable remotely using a crafted HTML page to bypass site isolation.
Which Chrome versions are affected?
Google Chrome versions prior to 153.0.8010.36 are affected.
Are users exposed simply by visiting a malicious page?
The available information does not describe this as a standalone drive-by issue: renderer-process compromise is a stated prerequisite. A crafted HTML page is used after that prerequisite to bypass site isolation.