What is CVE-2026-78898?

CVE-2026-78898 is a medium-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-08-25.

How severe is CVE-2026-78898?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Google Chrome

CVE-2026-78898

Incorrect authorization in Downloads in Google Chrome prior to 152.0.7977.65 allowed a remote attacker leveraging social engineering to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Broken Access Control

Published 2026-08-25 · last modified 2026-08-31.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (11.3th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

Google Chrome

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/499423269 (Permissions Required)

Frequently asked questions

What is CVE-2026-78898?: CVE-2026-78898 is a medium-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-08-25.
How severe is CVE-2026-78898?: Medium severity. CVSS v3 base score is 5.4 out of 10.