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Vulnerability record · CVE-2026-86889 · published 14 September 2026

CVE-2026-86889: Apple macos improper certificate validation vulnerability

Apple · Macos

A certificate validation issue was addressed with improved certificate validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An attacker in a privileged network position may be able to intercept network traffic.

4.8 CVSS 3.1 Medium EPSS 0.20% · top 91.6% CWE-295 · Improper certificate validation
4.8CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
16 Sep 2026Last modified by NVD

Description

A certificate validation issue was addressed with improved certificate validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An attacker in a privileged network position may be able to intercept network traffic.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.apple.com/en-us/149035 Vendor Advisory
https://support.apple.com/en-us/149042 Vendor Advisory
https://support.apple.com/en-us/149043 Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-86889), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.