What is CVE-2026-11253?

CVE-2026-11253 is a medium-severity vulnerability in Apple macOS, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.3/10. Published 2026-06-05.

How severe is CVE-2026-11253?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Apple macOS

CVE-2026-11253

Inappropriate implementation in Permissions in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)

Vulnerability class: Race Condition

Published 2026-06-05 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.5% 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: 0.001 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html (Vendor Advisory)
issues.chromium.org/issues/498397912 (Permissions Required)

Frequently asked questions

What is CVE-2026-11253?: CVE-2026-11253 is a medium-severity vulnerability in Apple macOS, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.3/10. Published 2026-06-05.
How severe is CVE-2026-11253?: Medium severity. CVSS v3 base score is 4.3 out of 10.