Quick answers
- Is CVE-2026-54987 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-54987 being exploited in the wild.
- How severe is CVE-2026-54987?
- High severity, with a CVSS score of 7.8, published 14 July 2026.
- Which products and versions are affected?
- Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows Server 2012 R2 All versions; Microsoft Windows 10 1607, 1809, 21H2, 22H2.
- Is there a fix for CVE-2026-54987?
- 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-2026-54987 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-54987?
- Check whether you run Microsoft Windows 11, Microsoft Windows Server 2012 R2 or Microsoft Windows 10 at an affected version. 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 (CWE-122) exists in the Windows Overlay Filter component. The vulnerability is triggered locally by an authenticated user with low privileges (PR:L). By exploiting this memory corruption issue, an attacker can execute arbitrary code with elevated system privileges. The attack does not require user interaction and has a high impact on confidentiality, integrity, and availability. Microsoft has released security updates for various versions of Windows 10, Windows 11, and Windows Server to address this issue.
Affected products
- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 R2 All versions
Timeline
- 2026-07-14: disclosed: Initial publication of the CVE record by Microsoft.
- 2026-07-14: advisory: NVD entry published.