What is CVE-2026-7958?

CVE-2026-7958 is a medium-severity vulnerability in Apple macOS, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-06.

How severe is CVE-2026-7958?

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

XSS in Apple macOS

CVE-2026-7958

Inappropriate implementation in ServiceWorker in Google Chrome prior to 148.0.7778.96 allowed an attacker who convinced a user to install a malicious extension to inject arbitrary scripts or HTML (UXSS) via a crafted Chrome Extension. (Chromium security severity: Medium)

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-05-06 · last modified 2026-06-17.

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 (5.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html (Release Notes, Vendor Advisory)
issues.chromium.org/issues/496632973 (Permissions Required)

Frequently asked questions

What is CVE-2026-7958?: CVE-2026-7958 is a medium-severity vulnerability in Apple macOS, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-06.
How severe is CVE-2026-7958?: Medium severity. CVSS v3 base score is 5.4 out of 10.