What is CVE-2026-13957?

CVE-2026-13957 is a medium-severity vulnerability in Google Chrome, classified under Cross-site Scripting. CVSS score: 4.2/10. Published 2026-06-30.

How severe is CVE-2026-13957?

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

XSS in Google Chrome

CVE-2026-13957

Incorrect security UI in Extensions in Google Chrome prior to 150.0.7871.47 allowed an attacker who convinced a user to install a malicious extension to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (6.7th percentile) — read the EPSS interpretation.

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.

Affected products

Google Chrome — versions 150.0.7871.47

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

chrome-cve-admin@google.com (Release Notes, Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required)

Frequently asked questions

What is CVE-2026-13957?: CVE-2026-13957 is a medium-severity vulnerability in Google Chrome, classified under Cross-site Scripting. CVSS score: 4.2/10. Published 2026-06-30.
How severe is CVE-2026-13957?: Medium severity. CVSS v3 base score is 4.2 out of 10.