CVE-2025-13762 identifies an improper input validation vulnerability (CWE-20) in the CyberArk Secure Web Sessions (SWS) Extension for Chrome and Edge browsers. The vulnerability arises because the extension does not adequately validate inputs when initiating new Secure Web Sessions, which can be manipulated to cause the extension to malfunction and result in a denial of service (DoS) condition. This DoS prevents users from successfully starting new SWS sessions, potentially disrupting privileged access workflows that rely on this extension for secure session management. The vulnerability affects all versions before 2.2.30305. The attack vector is local (AV:L), requiring the attacker to have access to the victim's browser environment but no privileges or authentication. User interaction is required (UI:P), meaning the victim must perform some action, such as clicking a malicious link or interacting with crafted content. The vulnerability does not impact confidentiality or integrity but affects availability with a low scope impact. The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:A/AU:Y) reflects these characteristics, resulting in a medium severity score of 4.8. No public exploits or active exploitation have been reported. The issue is relevant to organizations using CyberArk's extension to secure web sessions, particularly those managing privileged access in enterprise environments. The vulnerability highlights the importance of input validation in browser extensions that handle sensitive session management tasks.

For European organizations, the primary impact of this vulnerability is operational disruption due to denial of service in CyberArk Secure Web Sessions Extension. Organizations relying on CyberArk for privileged access management and secure session handling may experience interruptions in their ability to initiate secure sessions, potentially delaying critical administrative tasks and increasing risk exposure. While the vulnerability does not directly compromise data confidentiality or integrity, the availability impact can affect business continuity, especially in sectors with stringent access control requirements such as finance, healthcare, and government. Additionally, any disruption in privileged session management could indirectly increase security risks if fallback or manual processes are less secure. The requirement for local access and user interaction limits remote exploitation but insider threats or targeted phishing campaigns could leverage this vulnerability. Given CyberArk's widespread use in Europe for privileged access security, the vulnerability could affect a broad range of organizations, emphasizing the need for timely remediation.

1. Update the CyberArk Secure Web Sessions Extension to version 2.2.30305 or later as soon as the patch is available to eliminate the vulnerability. 2. Implement strict browser extension policies to restrict installation of unapproved or outdated extensions, reducing exposure to vulnerable versions. 3. Educate users about the risks of interacting with untrusted content or links that could trigger the vulnerability, minimizing user interaction risks. 4. Monitor browser and endpoint logs for unusual activity related to the Secure Web Sessions Extension to detect potential exploitation attempts. 5. Employ endpoint security controls to limit local access to sensitive systems and browsers running privileged access extensions. 6. Coordinate with CyberArk support for any interim mitigation guidance or workarounds until patches are deployed. 7. Integrate vulnerability management processes to ensure timely detection and remediation of browser extension vulnerabilities in privileged access environments.