What is CVE-2026-87553?

CVE-2026-87553 is a high-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 8.3/10. Published 2026-09-09.

How severe is CVE-2026-87553?

High severity. CVSS v3 base score is 8.3 out of 10.

Improper input validation in Google Chrome

CVE-2026-87553

Improper input validation in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Google Chrome

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chrome-cve-admin@google.com
chrome-cve-admin@google.com

Frequently asked questions

What is CVE-2026-87553?: CVE-2026-87553 is a high-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 8.3/10. Published 2026-09-09.
How severe is CVE-2026-87553?: High severity. CVSS v3 base score is 8.3 out of 10.