Quick answers
- Is CVE-2026-105009 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-105009 being exploited in the wild.
- How severe is CVE-2026-105009?
- High severity, with a CVSS score of 7.5, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Windows Server Update Service.
- Is there a fix for CVE-2026-105009?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-105009 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-105009?
- Check whether you run Microsoft Windows Server Update Service. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability stems from overly permissive default access control lists (ACLs) on Windows Server Update Service components, allowing an authenticated local attacker to write to protected directories or registry keys. By modifying WSUS configuration or binaries, an attacker can execute arbitrary code with elevated privileges. The issue requires local access and existing authentication credentials.
Affected products
- Microsoft Windows Server Update Service
Timeline
- 2026-10-13: disclosed