What is CVE-2026-20699?

CVE-2026-20699 is a medium-severity vulnerability in Apple macOS, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.2/10. Published 2026-03-25.

How severe is CVE-2026-20699?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in Apple macOS

CVE-2026-20699

A downgrade issue affecting Intel-based Mac computers was addressed with additional code-signing restrictions. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.3, macOS Tahoe 26.4. An app may be able to access user-sensitive data.

EPSS: 0.001 (3.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-20699?: CVE-2026-20699 is a medium-severity vulnerability in Apple macOS, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.2/10. Published 2026-03-25.
How severe is CVE-2026-20699?: Medium severity. CVSS v3 base score is 6.2 out of 10.