What is CVE-2026-7963?

CVE-2026-7963 is a high-severity vulnerability in Apple macOS, classified under Protection Mechanism Failure. CVSS score: 8.3/10. Published 2026-05-06.

How severe is CVE-2026-7963?

High severity. CVSS v3 base score is 8.3 out of 10.

Vulnerability in Apple macOS

CVE-2026-7963

Inappropriate implementation in ServiceWorker in Google Chrome prior to 148.0.7778.96 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)

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

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (20.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.8% 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: 0.003 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html (Release Notes, Vendor Advisory)
issues.chromium.org/issues/497250399 (Permissions Required)

Frequently asked questions

What is CVE-2026-7963?: CVE-2026-7963 is a high-severity vulnerability in Apple macOS, classified under Protection Mechanism Failure. CVSS score: 8.3/10. Published 2026-05-06.
How severe is CVE-2026-7963?: High severity. CVSS v3 base score is 8.3 out of 10.