What is CVE-2026-28900?

CVE-2026-28900 is a medium-severity vulnerability in Apple Macos, classified under Authentication Bypass by Spoofing. CVSS score: 5.5/10. Published 2026-07-27.

How severe is CVE-2026-28900?

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

Vulnerability in Apple Macos

CVE-2026-28900

A file quarantine bypass was addressed with additional checks. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8. A maliciously crafted ZIP archive may bypass Gatekeeper checks.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing
CWE-693 — Protection Mechanism Failure

References

product-security@apple.com
product-security@apple.com

Frequently asked questions

What is CVE-2026-28900?: CVE-2026-28900 is a medium-severity vulnerability in Apple Macos, classified under Authentication Bypass by Spoofing. CVSS score: 5.5/10. Published 2026-07-27.
How severe is CVE-2026-28900?: Medium severity. CVSS v3 base score is 5.5 out of 10.