Microsoft & Apple Patch CVSS 10.0 Flaws
Microsoft & Apple Patch Critical Flaws, Including CVSS 10.0 Bugs
CVE Identifiers
Full Report
Executive Summary
On August 6-7, 2026, Microsoft and Apple released a significant set of security updates addressing numerous high-severity vulnerabilities across their product lines. Microsoft patched a slate of flaws, most notably three with a maximum CVSS score of 10.0: CVE-2026-63508 in Planetary Computer Pro, CVE-2026-56162 in Azure SQL Database, and CVE-2026-65667 in Microsoft Teams. These vulnerabilities could allow for remote, unauthenticated privilege escalation. Four additional flaws rated 9.9 were also fixed in Azure and Active Directory. Apple addressed CVE-2026-65400, a 7.5 CVSS score vulnerability in macOS that could allow an attacker to bypass Screen Sharing authentication. Given the critical nature of these vulnerabilities, organizations are strongly advised to prioritize the deployment of these patches to all affected systems.
Vulnerability Details
Microsoft Vulnerabilities
Microsoft's updates addressed a wide range of products, with the most severe vulnerabilities allowing for remote code execution (RCE) or elevation of privilege (EoP).
CVSS 10.0 Vulnerabilities:
CVE-2026-63508: A missing authentication vulnerability in Microsoft Planetary Computer Pro that could lead to privilege escalation.CVE-2026-56162: An improper authentication issue in Azure SQL Database, allowing for privilege escalation.CVE-2026-65667: A missing authorization vulnerability in Microsoft Teams. Microsoft patched this on the server-side, so no end-user action is required.
CVSS 9.9 Vulnerabilities:
CVE-2026-50515: A remote code execution (RCE) vulnerability in Azure Service Bus.CVE-2026-62830: An elevation of privilege (EoP) vulnerability in Azure SRE Agent.CVE-2026-59115: An elevation of privilege (EoP) vulnerability in Microsoft Entra Provisioning Service.CVE-2026-50481: An elevation of privilege (EoP) vulnerability in Active Directory.
Apple Vulnerability
CVE-2026-65400(CVSS 7.5): An authentication bypass vulnerability in the Screen Sharing feature of macOS. A remote attacker on the same network could potentially gain access to a user's screen without providing valid credentials.
Google Vulnerability
- Chrome 151: Google released an update for its Chrome browser fixing 41 flaws, including six critical use-after-free vulnerabilities.
Affected Systems
- Microsoft:
- Microsoft Azure (multiple services including SQL Database, Service Bus, SRE Agent)
- Microsoft Teams
- Microsoft Planetary Computer Pro
- Microsoft Entra Provisioning Service
- Active Directory
- SharePoint
- Apple:
- macOS Tahoe (versions before 26.6.1)
- macOS Sequoia (versions before 15.7.9)
- macOS Sonoma (versions before 14.8.9)
- Google:
- Google Chrome (versions before 151)
Exploitation Status
The source articles do not state that any of these specific vulnerabilities are being actively exploited in the wild. However, given their severity, particularly the CVSS 10.0 and 9.9 flaws, exploitation is highly likely in the near future. Proof-of-concept (PoC) code will almost certainly be developed by security researchers and threat actors.
Impact Assessment
The impact of these vulnerabilities, if exploited, is severe. The Microsoft flaws rated 10.0 and 9.9 could grant attackers complete control over affected cloud services or on-premise servers, leading to data theft, service disruption, and lateral movement across corporate networks. The Apple vulnerability, while lower in severity, could lead to the compromise of sensitive information displayed on a user's screen and could be used as a stepping stone for further attacks within a network. Organizations that rely heavily on these ecosystems are at high risk until patches are applied.
Cyber Observables — Hunting Hints
The following patterns may help identify vulnerable or compromised systems:
screensharingdscreensharingd process.Detection Methods
- Vulnerability Scanners: Use vulnerability management tools to scan internal and external assets for the presence of these vulnerabilities. Ensure scanner plugins are updated to detect the specific CVEs.
- Asset Inventory: Maintain an accurate inventory of all software and operating system versions to quickly identify all systems affected by the Apple and Google patches.
- Cloud Configuration Review: For the Azure vulnerabilities, use cloud security posture management (CSPM) tools to audit configurations and detect signs of misconfiguration or compromise related to the affected services.
- Log Analysis: Proactively hunt for indicators of exploitation in Azure, Active Directory, and macOS logs, focusing on authentication and privilege escalation events. This aligns with D3FEND's
Domain Account Monitoring (D3-DAM).
Remediation Steps
Immediate patching is the primary remediation for these vulnerabilities.
- Microsoft Updates: Apply the August 2026 security updates from Microsoft as soon as possible, prioritizing critical systems, internet-facing servers, and domain controllers. The Teams vulnerability (
CVE-2026-65667) is patched server-side and requires no action. - Apple Updates: Update all affected macOS devices to macOS Tahoe 26.6.1, macOS Sequoia 15.7.9, or macOS Sonoma 14.8.9.
- Google Chrome Update: Ensure all instances of Google Chrome are updated to version 151 or later.
- Verification: After deploying patches, use vulnerability scanners to verify that the vulnerabilities have been successfully remediated.
- Workarounds: If patching is not immediately possible for the macOS flaw, consider disabling Screen Sharing service on vulnerable machines as a temporary mitigation. This is a form of
Application Configuration Hardening (D3-ACH).
Timeline of Events
MITRE ATT&CK Mitigations
Update Software
The primary and most effective mitigation is to apply the security patches provided by Microsoft, Apple, and Google to all affected systems.
As a temporary workaround for the macOS flaw, administrators can disable the Screen Sharing service on vulnerable devices if patching is not immediately feasible.
D3FEND Defensive Countermeasures
The most critical action for all organizations is the immediate application of these security updates (D3-SU). A risk-based patching strategy should be executed. First, prioritize internet-facing systems and critical infrastructure like Active Directory domain controllers and Azure cloud services, as these are the most likely targets for exploitation of the CVSS 9.9 and 10.0 vulnerabilities. Use automated patch management systems to deploy the Microsoft updates. For the Apple vulnerability (CVE-2026-65400), use Mobile Device Management (MDM) solutions to push the macOS updates to all corporate endpoints. Finally, ensure browser auto-update policies are enabled for Google Chrome. Patching should not be considered complete until deployment is verified through post-patch vulnerability scans. Given the severity, organizations should consider emergency change control procedures to expedite deployment.
For organizations unable to immediately patch the macOS Screen Sharing vulnerability (CVE-2026-65400), Application Configuration Hardening (D3-ACH) serves as a vital compensating control. Administrators should use an MDM or configuration management tool to disable the Screen Sharing service across the fleet of vulnerable Macs. This can be done by navigating to System Settings > General > Sharing and turning off 'Screen Sharing'. This action directly removes the vulnerable attack surface, mitigating the risk of exploitation until the patch can be deployed. This is particularly important for devices in untrusted networks (e.g., public Wi-Fi) where a same-network attacker could be present. While this is a temporary measure, it is a highly effective one for risk reduction.
To detect potential exploitation of the Active Directory Elevation of Privilege vulnerability (CVE-2026-50481), security teams must enhance their Domain Account Monitoring (D3-DAM). This involves configuring detailed security auditing on Domain Controllers and feeding those logs into a SIEM. Specifically, monitor for an unusual increase in Event ID 4738 (A user account was changed) or Event ID 4720 (A user account was created) followed by privilege changes. Create alerts for accounts being added to high-privilege groups like 'Domain Admins' or 'Enterprise Admins'. Baseline normal activity and hunt for deviations, such as service accounts performing actions outside their typical profile or logons occurring at unusual times. This proactive hunting can help detect an attacker who has successfully exploited the vulnerability and is attempting to establish persistence or escalate privileges further within the domain.
Timeline of Events
Microsoft and Apple begin releasing a series of critical security patches.
Security publications report on the wave of patches from Microsoft, Apple, and Google.
Sources & References
Article Author
Jason Gomes
• Cybersecurity PractitionerCybersecurity professional with over 10 years of specialized experience in security operations, threat intelligence, incident response, and security automation. Expertise spans SOAR/XSOAR orchestration, threat intelligence platforms, SIEM/UEBA analytics, and building cyber fusion centers. Background includes technical enablement, solution architecture for enterprise and government clients, and implementing security automation workflows across IR, TIP, and SOC use cases.
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