What is CVE-2026-7977?

CVE-2026-7977 is a medium-severity vulnerability in Apple macOS, classified under Improper Privilege Management. CVSS score: 6.3/10. Published 2026-05-06.

How severe is CVE-2026-7977?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Privilege escalation in Apple macOS

CVE-2026-7977

Inappropriate implementation in Canvas in Google Chrome prior to 148.0.7778.96 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: Medium)

Vulnerability class: Privilege Escalation

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

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (7.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% 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: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop.html (Vendor Advisory)
issues.chromium.org/issues/497821223 (Permissions Required, Issue Tracking)

Frequently asked questions

What is CVE-2026-7977?: CVE-2026-7977 is a medium-severity vulnerability in Apple macOS, classified under Improper Privilege Management. CVSS score: 6.3/10. Published 2026-05-06.
How severe is CVE-2026-7977?: Medium severity. CVSS v3 base score is 6.3 out of 10.