What is CVE-2016-1789?

CVE-2016-1789 is a medium-severity vulnerability in Apple Ibooks Author. CVSS score: 5.5/10. Published 2016-04-05.

How severe is CVE-2016-1789?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Apple Ibooks Author

CVE-2016-1789

Apple iBooks Author before 2.4.1 allows remote attackers to read arbitrary files via an iBooks Author file containing an XML external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.

Published 2016-04-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Apple Ibooks Author

References

support.apple.com/kb/HT206224 (Vendor Advisory)
lists.apple.com/archives/security-announce/2016/Mar/msg00008.html (vendor-advisory)

Frequently asked questions

What is CVE-2016-1789?: CVE-2016-1789 is a medium-severity vulnerability in Apple Ibooks Author. CVSS score: 5.5/10. Published 2016-04-05.
How severe is CVE-2016-1789?: Medium severity. CVSS v3 base score is 5.5 out of 10.