CVE-2026-20835 is classified as a CWE-125 out-of-bounds read vulnerability found in the Capability Access Management Service (camsvc) component of Microsoft Windows 11 Version 24H2 (build 10.0.26100.0). An out-of-bounds read occurs when a program reads data past the boundary of allocated memory, which can lead to disclosure of sensitive information stored in adjacent memory areas. In this case, an attacker with authorized local access can exploit this flaw to read memory contents that should be inaccessible, potentially exposing confidential data. The vulnerability does not require user interaction and has a low attack complexity, but it does require the attacker to have some level of local privileges (PR:L). The CVSS v3.1 base score is 5.5, indicating a medium severity level, with a high impact on confidentiality but no impact on integrity or availability. The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component without impacting other system components. No known exploits have been reported in the wild, and no patches have been released at the time of publication. This vulnerability highlights the importance of memory safety in system services that manage capability access and permissions within Windows 11.

The primary impact of CVE-2026-20835 is the potential disclosure of sensitive information from system memory to an authorized local attacker. This could include credentials, cryptographic keys, or other confidential data residing in memory adjacent to the accessed buffer. While the vulnerability does not allow modification of data or disruption of system availability, the confidentiality breach could facilitate further attacks such as privilege escalation or lateral movement within an organization’s network. Organizations with Windows 11 Version 24H2 deployed on endpoints or servers may face increased risk if local user accounts are compromised or if insider threats exist. The medium severity rating reflects the limited attack vector (local access required) and the absence of remote exploitation capabilities. However, in environments with many users or shared systems, the risk of information leakage could be significant, especially if sensitive data is exposed. The lack of a current patch means organizations must rely on compensating controls until a fix is available.

To mitigate the risk posed by CVE-2026-20835, organizations should implement the following specific measures: 1) Restrict local access to Windows 11 Version 24H2 systems to trusted and authorized personnel only, minimizing the number of users with local privileges. 2) Employ strict user account control policies and limit the use of privileged accounts to reduce the attack surface. 3) Monitor and audit local user activities for suspicious behavior that could indicate attempts to exploit this vulnerability. 4) Use endpoint detection and response (EDR) tools capable of detecting anomalous memory access patterns or unauthorized local privilege escalations. 5) Apply the principle of least privilege to all user accounts and services to limit potential damage from exploitation. 6) Stay informed about Microsoft security advisories and promptly apply any patches or updates once released for this vulnerability. 7) Consider isolating critical systems or sensitive environments to reduce the risk of local attacks. These targeted actions go beyond generic advice by focusing on controlling local access and monitoring for exploitation attempts specific to this vulnerability.