Quick answers
- Is CVE-2026-56177 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-56177 being exploited in the wild.
- How severe is CVE-2026-56177?
- High severity, with a CVSS score of 7.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Server.
- Is there a fix for CVE-2026-56177?
- 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-2026-56177 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-56177?
- Check whether you run Microsoft Windows Server. 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 use-after-free vulnerability in Windows Server allows an authorized local attacker to elevate privileges. The flaw is in memory management where a freed object is accessed again, potentially allowing code execution. Exploitation requires local access and existing authentication; the attacker cannot exploit this remotely. A successful exploit grants the attacker system-level privileges, potentially compromising the entire server and its hosted applications. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows Server
Timeline
- 2026-09-08: disclosed