What is CVE-2026-76033?

CVE-2026-76033 is a medium-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 4.2/10. Published 2026-08-18.

How severe is CVE-2026-76033?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Improper input validation in Google Chrome

CVE-2026-76033

Inappropriate implementation in CORS in Google Chrome prior to 151.0.7922.169 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)

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

Published 2026-08-18 · last modified 2026-08-20.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (11.1th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.1% 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: 0.002 · change: -0.001

Affected products

Google Chrome

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0826575… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/516715010 (Permissions Required)

Frequently asked questions

What is CVE-2026-76033?: CVE-2026-76033 is a medium-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 4.2/10. Published 2026-08-18.
How severe is CVE-2026-76033?: Medium severity. CVSS v3 base score is 4.2 out of 10.