What is CVE-2026-9989?

CVE-2026-9989 is a medium-severity vulnerability in Apple macOS, classified under Origin Validation Error. CVSS score: 6.3/10. Published 2026-05-28.

How severe is CVE-2026-9989?

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

Vulnerability in Apple macOS

CVE-2026-9989

Inappropriate implementation in Media in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to bypass same origin policy via a crafted video file. (Chromium security severity: High)

Published 2026-05-28 · last modified 2026-07-21.

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 (3.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.7% 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-346 — Origin Validation Error

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304… (Vendor Advisory)
issues.chromium.org/issues/513054053 (Permissions Required)

Frequently asked questions

What is CVE-2026-9989?: CVE-2026-9989 is a medium-severity vulnerability in Apple macOS, classified under Origin Validation Error. CVSS score: 6.3/10. Published 2026-05-28.
How severe is CVE-2026-9989?: Medium severity. CVSS v3 base score is 6.3 out of 10.