What is CVE-2026-106309?

CVE-2026-106309 is a high-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-10-06.

How severe is CVE-2026-106309?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Google Chrome

CVE-2026-106309

Incorrect authorization in Selection in Google Chrome on on iOS prior to 155.0.8059.39 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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/503708636 (Permissions Required)

Frequently asked questions

What is CVE-2026-106309?: CVE-2026-106309 is a high-severity vulnerability in Google Chrome, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-10-06.
How severe is CVE-2026-106309?: High severity. CVSS v3 base score is 8.8 out of 10.