Multiple Windows RDP Vulnerabilities Allow Attackers to Access Sensitive Data
Microsoft has patched five 'Important' rated information disclosure vulnerabilities in Windows RDP, potentially exposing sensitive system memory data.
Microsoft has released crucial security updates to address a cluster of five information disclosure vulnerabilities affecting the Windows Remote Desktop Protocol (RDP). These flaws, collectively rated 'Important' with a CVSS base score of 6.5, could allow attackers to read sensitive data from system memory during remote sessions.
The vulnerabilities impact a broad spectrum of supported Windows client and server versions, including Windows 10, Windows 11, and various Windows Server releases. The affected versions were patched on July 14, 2026, as part of Microsoft's regular security updates.
Tracked as CVE-2026-50445, CVE-2026-57982, CVE-2026-55003, CVE-2026-50497, and CVE-2026-57979, these issues stem from memory safety flaws within the RDP implementation. Specifically, CVE-2026-50445 and CVE-2026-57979 involve buffer over-read and out-of-bounds read vulnerabilities, enabling the RDP stack to inadvertently access data beyond its intended boundaries. This could expose sensitive heap memory contents to an attacker over the network.
Furthermore, CVE-2026-57982, CVE-2026-55003, and a portion of CVE-2026-50497 are attributed to the use of uninitialized resources. In these instances, RDP interacts with memory regions that were not properly cleared, potentially retaining and exposing residual sensitive data from previous operations.
While Microsoft's exploitability index currently suggests these vulnerabilities are 'less likely' or 'unlikely' to be exploited, and no public proof-of-concept exploits or in-the-wild activity have been reported, the potential impact is significant. Successful exploitation could enable an unauthenticated or low-privileged remote attacker to extract sensitive information from process memory during RDP sessions. This could include credentials, session tokens, or memory addresses that might weaken security defenses like Address Space Layout Randomization (ASLR), facilitating subsequent attacks.
The affected products span multiple Windows generations, including Windows 10 (versions 1607, 1809, 21H2, 22H2), Windows 11 (versions 24H2, 25H2, 26H1), and Windows Server (2012, 2012 R2, 2016, 2019, 2022, 2025). Microsoft has provided official fixes through the July 2026 cumulative updates and monthly rollups.
Administrators are strongly advised to prioritize the deployment of these patches for all impacted Windows builds. It is also recommended to restrict RDP access by enforcing strong authentication, minimizing network exposure, and actively monitoring for any unusual RDP activity, especially for environments where RDP is accessible over the internet or untrusted networks.