Microsoft has addressed five information disclosure vulnerabilities affecting the Windows Remote Desktop Protocol (RDP) in its July 2026 Patch Tuesday release, each carrying an “Important” severity rating and posing risks to organizations that rely heavily on remote desktop connectivity for daily operations.
The vulnerabilities tracked as CVE-2026-50445, CVE-2026-50497, CVE-2026-55003, CVE-2026-57979, and CVE-2026-57982 were all disclosed on July 14, 2026, and share a common impact category: unauthorized disclosure of sensitive information.
All five carry a CVSS 3.1 base score of 6.5 (temporal score 5.7), with an identical attack vector: network-based, low attack complexity, no privileges required (except CVE-2026-57982, which requires low privileges), and user interaction required.
Multiple Windows RDP Vulnerabilities
Each vulnerability stems from a distinct memory-handling weakness within the RDP stack:
- CVE-2026-50445 arises from a buffer overflow (CWE-126), where the RDP component reads beyond the allocated buffer boundary, potentially leaking adjacent memory contents to an attacker.
- CVE-2026-50497 combines an off-by-one error (CWE-193) with use of an uninitialized resource (CWE-908), a pairing that can cause the system to expose residual memory data during RDP session processing.
- CVE-2026-55003 and CVE-2026-57982 both stem from use of uninitialized resources (CWE-908), where memory that hasn’t been properly initialized is read and potentially returned to a remote party.
- CVE-2026-57979 results from an out-of-bounds read (CWE-125), allowing access to data outside the intended memory region during RDP communication.
All five flaws follow a similar exploitation pattern: an attacker would need to convince a target to interact with a malicious RDP session or connection (satisfying the “User Interaction: Required” requirement), after which flawed memory-handling logic in the RDP stack could leak fragments of process memory.
Because the confidentiality impact is rated “High” while integrity and availability remain unaffected, successful exploitation would allow an attacker to read sensitive data such as session tokens, in-memory credentials, or other residual artifacts without directly modifying the system or disrupting service.
RDP remains one of the most heavily targeted protocols in enterprise environments, frequently abused as an initial access vector for ransomware operators and other threat actors.
Even though these five vulnerabilities are classified as information disclosure rather than remote code execution, leaked memory content can serve as a stepping stone for more damaging follow-on attacks, including credential theft and lateral movement.
Microsoft has assigned itself as the CNA for all five CVEs and rated the exploitability as “Exploitation Unlikely” at present, though this assessment can shift quickly once proof-of-concept code circulates.
Mitigation
Security teams should prioritize applying the July 2026 cumulative updates across all affected Windows versions immediately, since delayed patching leaves systems exposed to memory-leak conditions that attackers can chain into larger campaigns.
Organizations should also restrict RDP exposure to the internet by using VPNs or Remote Desktop Gateways instead of direct access, and enable Network Level Authentication to reduce the attack surface that requires user interaction.
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