CVE entry · CVE-2026-65400
CVE-2026-65400: Apple macOS Improper Authentication Vulnerability
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
- Actively exploited: added to CISA’s KEV catalog on August 18, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: August 21, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Apple macOS, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (support.apple.com)
- Vendor advisory or reference cited by CISA (support.apple.com)
- Vendor advisory or reference cited by CISA (support.apple.com)
- NVD entry (NIST)
- CISA KEV catalog
Other Apple vulnerabilities
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Apple Multiple Products Out-of-Bounds Write Vulnerability
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Apple Multiple Products Classic Buffer Overflow Vulnerability
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Apple Multiple Products Improper Locking Vulnerability
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Apple Multiple Products Buffer Overflow Vulnerability
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Apple Multiple products Use-After-Free Vulnerability
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Apple iOS and iPadOS Use-After-Free Vulnerability