[NEW] [medium] Apple macOS (Sonoma, Sequoia and Tahoe): Vulnerability enables security feature bypass

highpublic exploitCVE-2026-65400

A remote, authenticated attacker can exploit a vulnerability in Apple macOS to bypass security features.

CSIRTS triage

vendor: Apple product: macOSOtheraffected: Sonoma, Sequoia, Tahoe

What: A remote vulnerability allows an authenticated attacker to bypass security features.
Who is affected: Users running macOS Sonoma, Sequoia, or Tahoe with remote access enabled.
Urgency: Medium priority; requires authentication and is not exploited, but affects core security mechanisms.
Action: Update to the latest patch for your macOS version.

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

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-13
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2687

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
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
unknownVulnerability in Apple macOS (August 07, 2026)cert-fr-avis
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
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
unknownexploitedApple macOS Security Restriction Bypass Vulnerabilityhkcert · 2026-08-07