What is CVE-2020-26540?

CVE-2020-26540 is a high-severity vulnerability in Apple macOS, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2020-10-02.

How severe is CVE-2020-26540?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apple macOS

CVE-2020-26540

An issue was discovered in Foxit Reader and PhantomPDF before 4.1 on macOS. Because the Hardened Runtime protection mechanism is not applied to code signing, code injection (or an information leak) can occur.

Published 2020-10-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

www.foxitsoftware.com/support/security-bulletins.html (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-26540?: CVE-2020-26540 is a high-severity vulnerability in Apple macOS, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2020-10-02.
How severe is CVE-2020-26540?: High severity. CVSS v3 base score is 7.5 out of 10.