CVE-2026-87603 Missing authorization in Chrome

What is CVE-2026-87603?

CVE-2026-87603 is a medium-severity missing authorization vulnerability in Google Chrome, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Missing authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)

Weakness: CWE-862

Which versions are affected by CVE-2026-87603?

It affects 1 product.

Products include Google Chrome.

How do I fix CVE-2026-87603?

Upgrade to a fixed version.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-87603 being exploited?

There is no known exploitation of CVE-2026-87603 in the wild and no public exploit code.

Other vulnerabilities in Google Chrome

• CVE-2022-4135 Google Chromium GPU Heap Buffer Overflow Exploited Critical 9.6
• CVE-2020-16017 Google Chrome Use-After-Free Exploited Critical 9.6
• CVE-2020-16010 Google Chrome for Android UI Heap Buffer Overflow Exploited Critical 9.6
• CVE-2026-87491 Google Chromium V8 Out of Bounds Write Exploited High 8.8
• CVE-2026-85046 Google Chromium V8 Type Confusion Exploited High 8.8

All Google Chrome vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-87603, ECHO-3b62-ae72-d8a7, GHSA-p892-533f-47v3, MINI-8q4p-9q87-fvx2.