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CVE-2026-58527 Microsoft CVE debrief

CVE-2026-58527 is a high-severity vulnerability in Windows Runtime that allows an authorized attacker to elevate privileges locally due to a race condition. The CVE record was published on 2026-07-14T18:18:39.207Z and has not been modified since then. This vulnerability, classified as a race condition, can be exploited in Windows 11 24H2, 25H2, 26H1, Windows Server 2022, and Windows Server 2025. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. System administrators and security teams should prioritize patching this vulnerability to prevent potential privilege escalation attacks. The official patch from Microsoft is available, and it is recommended to apply it as soon as possible. Conducting a thorough inventory of Windows systems within the organization to identify potentially affected systems and prioritizing patching for systems with high-privilege access or those that are most critical to business operations is crucial. Additionally, monitoring system logs for any suspicious activity that could indicate attempted exploitation of this vulnerability and considering implementing additional security measures such as multi-factor authentication and least privilege access can mitigate the impact of potential exploitation.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-20
Advisory published
2026-07-14
Advisory updated
2026-07-20

Who should care

System administrators and security teams responsible for Windows systems, especially those with high-privilege access, should prioritize patching this vulnerability to prevent potential privilege escalation attacks.

Technical summary

CVE-2026-58527 is a race condition vulnerability in Windows Runtime that can be exploited by an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. Affected systems include Windows 11 24H2, 25H2, 26H1, Windows Server 2022, and Windows Server 2025.

Defensive priority

High priority should be given to patching this vulnerability, especially in environments where privilege escalation could have significant impacts.

Recommended defensive actions

  • Apply the official patch from Microsoft as soon as possible.
  • Conduct a thorough inventory of Windows systems within the organization to identify potentially affected systems.
  • Prioritize patching for systems with high-privilege access or those that are most critical to business operations.
  • Monitor system logs for any suspicious activity that could indicate attempted exploitation of this vulnerability.
  • Consider implementing additional security measures such as multi-factor authentication and least privilege access to mitigate the impact of potential exploitation.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, its severity, and affected systems. Microsoft has provided a patch and advisory for this vulnerability.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:18:39.207Z and has not been modified since then.