# CVE-2026-50666: Microsoft Windows Remote Access Connection Manager use after free privilege escalation

Source: https://junglewise.ai/threats/cve-2026-50666-microsoft-windows-remote-access-connection-manager-use-after-free  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-50666 · Severity: high · CVSS 8.8 · Published 2026-07-14

A security vulnerability has been identified in the Windows Remote Access Connection Manager, a component that handles network and VPN connections. An attacker with basic user access to the network could exploit this flaw to gain higher-level administrative privileges on a target system. This could allow an unauthorized individual to take full control of affected computers, potentially leading to data theft or further network compromise.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows Server 2012 R2](https://junglewise.ai/threats/technologies/windows-server-2012-r2), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-50666 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-50666 being exploited in the wild.

**How severe is CVE-2026-50666?** High severity, with a CVSS score of 8.8, 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-2026-50666?** 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-2026-50666 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-50666?** 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

This vulnerability is classified as a Use-After-Free (CWE-416) within the Windows Remote Access Connection Manager (rasman.dll). The flaw is reachable over the network and requires low-privileged authentication (PR:L). By sending specially crafted requests to the service, an attacker can trigger memory corruption to execute arbitrary code or gain SYSTEM-level privileges. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server 2012 R2. Microsoft has released security updates to address this issue; users should apply the latest cumulative updates for their respective OS versions.

## 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
- 2026-07-14: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50666](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50666)

## Related threats

- [Microsoft Windows Recovery Environment UEFI/BIOS password bypass](https://junglewise.ai/threats/cve-2026-116638-the-windows-recovery-environment-winre-in-windows-10-and-11-may)
- [Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.](https://junglewise.ai/threats/cve-2026-68820-microsoft-windows-ancillary-function-driver-for-winsock-use-after)
- [Microsoft Windows Backup Engine privilege escalation](https://junglewise.ai/threats/cve-2026-58598-microsoft-windows-backup-engine-privilege-escalation)
- [Microsoft Windows Boot Loader security feature bypass](https://junglewise.ai/threats/cve-2026-58638-microsoft-windows-boot-loader-security-feature-bypass)
- [Microsoft Windows Client-Side Caching Service privilege escalation](https://junglewise.ai/threats/cve-2026-58637-microsoft-windows-client-side-caching-service-privilege)