What is CVE-2026-106391?

CVE-2026-106391 is a medium-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 4.2/10. Published 2026-10-06.

How severe is CVE-2026-106391?

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

Auth bypass in Google Chrome

CVE-2026-106391

Incorrect authorization in WebShare in Google Chrome on on Android prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Broken Access Control

Published 2026-10-06 · last modified 2026-10-07.

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:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Google Chrome

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_0864717… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/522325665 (Permissions Required)

Frequently asked questions

What is CVE-2026-106391?: CVE-2026-106391 is a medium-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 4.2/10. Published 2026-10-06.
How severe is CVE-2026-106391?: Medium severity. CVSS v3 base score is 4.2 out of 10.