Vulnerability in Apple macOS (August 07, 2026)

unknownpublic exploitCVE-2026-65400

A vulnerability has been discovered in Apple macOS. It allows an attacker to cause a security policy bypass.

CSIRTS triage

vendor: Apple product: macOSMisconfiguration

What: A macOS vulnerability allows attackers to bypass security policy controls.
Who is affected: macOS systems running affected versions.
Urgency: Moderate; security policy bypass reduces isolation between user and system processes.
Action: Apply available macOS security updates from Apple.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-08-07
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0980/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Exploitation confirmedCVE-2026-65400Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 52% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-65400	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedApple security advisory (AV26-823) – Update 1cccs
highexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
criticalexploitedCVE-2026-65400: Apple macOS Improper Authentication Vulnerabilitycisa-kev
high[NEW] [medium] Apple macOS (Sonoma, Sequoia and Tahoe): Vulnerability enables security feature bypasscert-bund
unknownexploitedNCSC-2026-0280 [1.01] [M/H] Vulnerability patched in macOS Screen Sharing by Applencsc-nl
unknownNCSC-2026-0280 [1.00] [M/H] Vulnerability fixed in macOS Screen Sharing by Applencsc-nl
unknownexploitedApple macOS Security Restriction Bypass Vulnerabilityhkcert
highCVE-2026-65400: An authentication issue was addressed with improved state management. This issue is fixed in m…nvd

Recent advisories for Apple macOS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Apple macOS, iOS and iPadOS: Multiple vulnerabilitiescert-bund · 2026-08-19
criticalexploitedCVE-2026-65400: Apple macOS Improper Authentication Vulnerabilitycisa-kev · 2026-08-18
high[NEW] [medium] Apple macOS (Sonoma, Sequoia and Tahoe): Vulnerability enables security feature bypasscert-bund · 2026-08-13
unknownexploitedNCSC-2026-0280 [1.01] [M/H] Vulnerability patched in macOS Screen Sharing by Applencsc-nl · 2026-08-12
unknownNCSC-2026-0280 [1.00] [M/H] Vulnerability fixed in macOS Screen Sharing by Applencsc-nl · 2026-08-07
high[NEW] [high] Apple macOS (Tahoe, Sonoma, and Sequoia): Multiple vulnerabilitiescert-bund · 2026-08-07