What is CVE-2019-8754?

CVE-2019-8754 is a medium-severity vulnerability in Apple macOS, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2020-10-27.

How severe is CVE-2019-8754?

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

Vulnerability in Apple macOS

CVE-2019-8754

A cross-origin issue existed with "iframe" elements. This was addressed with improved tracking of security origins. This issue is fixed in macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006. A malicious HTML document may be able to render iframes with sensitive user information.

Published 2020-10-27 · last modified 2026-06-17.

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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

support.apple.com/en-us/HT210722 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-8754?: CVE-2019-8754 is a medium-severity vulnerability in Apple macOS, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2020-10-27.
How severe is CVE-2019-8754?: Medium severity. CVSS v3 base score is 6.5 out of 10.