Quick answers
- Is CVE-2026-77899 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77899 being exploited in the wild.
- How severe is CVE-2026-77899?
- High severity, with a CVSS score of 7, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Security Center.
- Is there a fix for CVE-2026-77899?
- 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-2026-77899 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-77899?
- Check whether you run Microsoft Windows Security Center. 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 is a use-after-free condition in Windows Security Center that permits local privilege escalation. An authorized attacker with local access can trigger the use-after-free to achieve privilege elevation. The attack requires prior authentication/access to the system (not unauthenticated network-based). Successful exploitation results in elevated privileges, typically leading to system compromise. Patches from Microsoft are available through their security update channels.
Affected products
- Microsoft Windows Security Center
Timeline
- 2026-09-08: disclosed: CVE-2026-77899 published