What is CVE-2020-9860?

CVE-2020-9860 is a medium-severity vulnerability in Apple Safari. CVSS score: 5.4/10. Published 2020-10-27.

How severe is CVE-2020-9860?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Apple Safari

CVE-2020-9860

A custom URL scheme handling issue was addressed with improved input validation. This issue is fixed in Safari 13.0.5. Processing a maliciously crafted URL may lead to arbitrary javascript code execution.

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

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Apple Safari — versions unspecified

References

support.apple.com/en-us/HT210922 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-9860?: CVE-2020-9860 is a medium-severity vulnerability in Apple Safari. CVSS score: 5.4/10. Published 2020-10-27.
How severe is CVE-2020-9860?: Medium severity. CVSS v3 base score is 5.4 out of 10.