What is CVE-2026-87534?

CVE-2026-87534 is a critical-severity vulnerability in Google Chrome, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-09-09.

How severe is CVE-2026-87534?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Google Chrome

CVE-2026-87534

Missing authorization in WebView in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to bypass system access restrictions via crafted network traffic. (Chromium security severity: Medium)

Vulnerability class: Broken Access Control

Published 2026-09-09 · last modified 2026-09-10.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (20.7th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.7% 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

Google Chrome

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/513134173 (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-87534?: CVE-2026-87534 is a critical-severity vulnerability in Google Chrome, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-09-09.
How severe is CVE-2026-87534?: Critical severity. CVSS v3 base score is 9.8 out of 10.