What is CVE-2026-11217?

CVE-2026-11217 is a medium-severity vulnerability in Apple macOS, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2026-06-04.

How severe is CVE-2026-11217?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apple macOS

CVE-2026-11217

Inappropriate implementation in Fenced Frames in Google Chrome prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Low)

Published 2026-06-04 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.002 (3.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.6% 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-346 — Origin Validation Error

References

chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html (Vendor Advisory)
issues.chromium.org/issues/487564032 (Permissions Required)

Frequently asked questions

What is CVE-2026-11217?: CVE-2026-11217 is a medium-severity vulnerability in Apple macOS, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2026-06-04.
How severe is CVE-2026-11217?: Medium severity. CVSS v3 base score is 6.5 out of 10.