Auth bypass in Google Chrome
CVE-2026-87606
Missing authorization in SiteIsolation 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: Medium)
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145… (Release Notes, Vendor Advisory)
- issues.chromium.org/issues/495933780 (Permissions Required)
Frequently asked questions
- What is CVE-2026-87606?
- CVE-2026-87606 is a high-severity vulnerability in Google Chrome, classified under Missing Authorization. CVSS score: 8.1/10. Published 2026-09-09.
- How severe is CVE-2026-87606?
- High severity. CVSS v3 base score is 8.1 out of 10.