Quick answers
- Is CVE-2026-105503 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-105503 being exploited in the wild.
- How severe is CVE-2026-105503?
- High severity, with a CVSS score of 7.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Windows Management Instrumentation.
- Is there a fix for CVE-2026-105503?
- 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-2026-105503 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-105503?
- Check whether you run Microsoft Windows Management Instrumentation. 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
A heap-based buffer overflow vulnerability exists in Windows Management Instrumentation that can be exploited by an authenticated local user to achieve privilege escalation. The vulnerability requires local access and authentication credentials; it cannot be exploited remotely. Successful exploitation results in code execution with SYSTEM privileges.
Affected products
- Microsoft Windows Management Instrumentation
Timeline
- 2026-11-10: disclosed