CVE-2026-86881 Apple - Authentication Bypass

Apple iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27 contain a certificate validation bypass caused by improper validation of intermediate certificate authorities, letting attackers with compromised intermediate CAs issue certificates with arbitrary extended key usages, exploit requires compromised intermediate CA.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
EPSS
0.40% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Man In The Middle
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-295

Vendor fix

Update to iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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