What is CVE-2018-4319?

CVE-2018-4319 is a high-severity vulnerability in Apple Icloud, classified under Origin Validation Error. CVSS score: 8.1/10. Published 2019-04-03.

How severe is CVE-2018-4319?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Apple Icloud

CVE-2018-4319

A cross-origin issue existed with "iframe" elements. This was addressed with improved tracking of security origins. This issue affected versions prior to iOS 12, watchOS 5, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7.

Published 2019-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Apple Icloud
Apple Iphone OS
Apple Itunes
Apple Safari
iOS, watchOS, Safari, Itunes For Windows, Icloud Windows — versions Versions prior to: iOS 12, watchOS 5, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

support.apple.com/kb/HT209141 (Vendor Advisory)
support.apple.com/kb/HT209140 (Vendor Advisory)
support.apple.com/kb/HT209106 (Vendor Advisory)
support.apple.com/kb/HT209108 (Vendor Advisory)
support.apple.com/kb/HT209109 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4319?: CVE-2018-4319 is a high-severity vulnerability in Apple Icloud, classified under Origin Validation Error. CVSS score: 8.1/10. Published 2019-04-03.
How severe is CVE-2018-4319?: High severity. CVSS v3 base score is 8.1 out of 10.