Microsoft has released July 2026 Patch Tuesday security updates to address five Important information disclosure vulnerabilities affecting the Windows Remote Desktop Protocol (RDP). The flaws, tracked as CVE-2026-50445, CVE-2026-57982, CVE-2026-55003, CVE-2026-50497, and CVE-2026-57979, each carry a CVSS score of medium and impact a broad range of supported Windows client and server platforms, including Windows 10, Windows 11, and Windows Server 2012 through Windows Server 2025. While these vulnerabilities do not allow remote code execution, they expose sensitive information from system memory, making them a significant concern for organizations that rely on RDP for remote administration and enterprise access.

The vulnerabilities stem from memory safety issues within the RDP implementation. Specifically, CVE-2026-50445 and CVE-2026-57979 are caused by buffer over-read and out-of-bounds read conditions, allowing the RDP service to access memory beyond intended buffer boundaries and potentially disclose heap memory contents. Meanwhile, CVE-2026-57982, CVE-2026-55003, and part of CVE-2026-50497 result from the use of uninitialized memory resources, where previously used but uncleared memory may expose sensitive information. Successful exploitation could reveal credentials, session tokens, protocol states, or memory addresses that may assist attackers in bypassing security protections such as Address Space Layout Randomization (ASLR) and facilitate follow-on attacks.

Although Microsoft currently rates these vulnerabilities as "Less Likely" or "Unlikely" to be exploited and has reported no public proof-of-concept exploits or active in-the-wild attacks, the potential impact remains significant. Depending on the vulnerability, exploitation may require either a victim to initiate an RDP connection or an authenticated low-privileged user capable of sending specially crafted RDP traffic. In enterprise environments where RDP sessions often operate with elevated privileges and process sensitive information, successful memory disclosure could aid credential theft, lateral movement, and the chaining of these flaws with other vulnerabilities, including previously disclosed RDP privilege-escalation issues.

To mitigate the risk, Microsoft has released fixes through the July 2026 Patch Tuesday cumulative updates and monthly rollups, available via Windows Update and the Microsoft Update Catalog. Organizations should prioritize deploying these updates across all affected Windows systems, particularly internet-facing RDP servers and virtual desktop infrastructure. Administrators should also strengthen RDP security by enforcing Network Level Authentication (NLA), implementing strong authentication and multi-factor authentication where possible, restricting RDP exposure through firewalls or VPNs, limiting access to trusted networks, and continuously monitoring RDP activity for suspicious behavior. Prompt patching, combined with layered security controls, is essential to reduce the risk of information disclosure and prevent attackers from leveraging leaked memory to facilitate broader network compromise.