CVE-2025-11957 is a security vulnerability identified in Devolutions Server, a privileged access management solution widely used for secure credential and vault management. The flaw exists in the temporary access workflow of versions 2025.2.12.0 and earlier, where improper authorization checks allow an authenticated basic user to manipulate API requests to self-approve or approve temporary access requests for other users. This bypasses intended access controls, granting unauthorized access to vaults and sensitive entries that should be restricted. The root cause is classified under CWE-639, which pertains to authorization bypass through user-controlled keys or parameters. The vulnerability does not require elevated privileges beyond basic authentication and does not depend on user interaction beyond sending crafted API requests. Although no public exploits have been reported yet, the vulnerability poses a significant risk because it undermines the core security model of Devolutions Server, potentially exposing sensitive credentials and secrets managed within the system. The lack of a CVSS score indicates the need for a severity assessment based on impact and exploitability factors. The vulnerability affects all deployments running the specified versions and earlier, emphasizing the need for timely remediation. Since Devolutions Server is often used in enterprise environments to manage privileged access, exploitation could lead to lateral movement, data exfiltration, or further compromise within affected networks.

For European organizations, this vulnerability could have severe consequences, especially in sectors such as finance, healthcare, government, and critical infrastructure where Devolutions Server is used to safeguard privileged credentials. Unauthorized access to vaults could lead to exposure of sensitive credentials, enabling attackers to escalate privileges, move laterally, or exfiltrate confidential data. This compromises confidentiality and potentially integrity of critical systems. The ability for a basic authenticated user to bypass authorization controls increases the attack surface and insider threat risk. Given the centralized role of Devolutions Server in managing access, exploitation could disrupt operational continuity and trust in security controls. Organizations with complex access workflows relying on temporary access approvals are particularly vulnerable. The absence of known exploits currently provides a window for proactive mitigation, but the risk of future exploitation remains high. The impact extends beyond individual organizations to supply chains and partners connected through shared credentials or access management systems.

To mitigate this vulnerability, organizations should: 1) Monitor Devolutions Server usage logs for unusual temporary access approvals or API request patterns indicative of abuse. 2) Restrict basic user privileges to the minimum necessary and review access control policies to limit who can request or approve temporary access. 3) Implement network segmentation and multi-factor authentication to reduce the impact of compromised credentials. 4) Engage with Devolutions for patches or updates addressing this vulnerability as soon as they become available and apply them promptly. 5) Conduct internal audits of temporary access workflows to detect and remediate any unauthorized approvals. 6) Employ anomaly detection tools to identify suspicious behavior related to vault access. 7) Educate users about the risks of unauthorized access and enforce strict change management for access control configurations. 8) Consider additional compensating controls such as just-in-time access and session monitoring to reduce exposure windows.