What is CVE-2020-9788?

CVE-2020-9788 is a high-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2020-06-09.

How severe is CVE-2020-9788?

High severity. CVSS v3 base score is 7.8 out of 10.

Improper input validation in Apple macOS

CVE-2020-9788

A validation issue was addressed with improved input sanitization. This issue is fixed in macOS Catalina 10.15.5. A file may be incorrectly rendered to execute JavaScript.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.6% 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 macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support.apple.com/HT211170 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-9788?: CVE-2020-9788 is a high-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2020-06-09.
How severe is CVE-2020-9788?: High severity. CVSS v3 base score is 7.8 out of 10.