CVE-2025-50977 is a template injection vulnerability that results in reflected cross-site scripting (XSS) within a web application component using Angular expressions. The vulnerability specifically affects version 1.7.1 of an unspecified software product. It arises from improper sanitization of the 'r' parameter, which allows an authenticated administrator to inject malicious Angular expressions. These expressions execute arbitrary JavaScript code in the context of the vulnerable application. Exploitation can occur via GET requests to the summary endpoint or POST requests to certain Wicket interface endpoints, with the GET method being easier to weaponize. Since exploitation requires authenticated admin access, the attack surface is limited to users with elevated privileges. Successful exploitation could lead to client-side code execution, enabling session hijacking, theft of sensitive data, or further privilege escalation within the application or connected systems. The vulnerability is categorized under CWE-79 (Improper Neutralization of Input During Web Page Generation), indicating a classic reflected XSS scenario. The CVSS v3.1 base score is 6.1 (medium severity), reflecting the network attack vector, low attack complexity, no privileges required (PR:N) but user interaction required (UI:R), with a scope change (S:C) and limited confidentiality and integrity impacts (C:L/I:L), and no availability impact (A:N). No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was published on August 27, 2025, with the CVE reserved on June 16, 2025.

For European organizations, this vulnerability poses a moderate risk primarily to internal administrative users of the affected software. Since exploitation requires authenticated admin access, the threat is more about insider threats or compromised admin credentials rather than external attackers directly exploiting the flaw. If exploited, attackers could execute arbitrary JavaScript in the context of the application, potentially hijacking admin sessions, stealing sensitive configuration or user data, or escalating privileges further within the system. This could lead to broader compromise of enterprise systems, data breaches, or disruption of business operations. Organizations relying on this software for critical business functions or managing sensitive data are at higher risk. The reflected XSS nature also means that crafted URLs or requests could be used in phishing campaigns targeting admins, increasing the risk of successful exploitation. Given the medium CVSS score and the requirement for admin authentication, the overall impact is significant but not critical. However, the potential for lateral movement and data exfiltration elevates the importance of timely mitigation.

1. Immediate mitigation should focus on restricting and monitoring administrative access to the affected application, ensuring that only trusted personnel have admin privileges. 2. Implement strict input validation and sanitization on the 'r' parameter and any other user-controllable inputs, especially those processed by Angular templates. 3. Apply Content Security Policy (CSP) headers to limit the execution of unauthorized scripts within the application context. 4. Conduct thorough code reviews and security testing of the affected endpoints, particularly the summary endpoint and Wicket interface endpoints, to identify and remediate similar injection vectors. 5. Enforce multi-factor authentication (MFA) for all admin users to reduce the risk of credential compromise. 6. Monitor logs for unusual GET or POST requests targeting the vulnerable endpoints, especially those containing suspicious Angular expressions or script payloads. 7. Prepare to deploy patches or updates from the vendor once available; in the meantime, consider temporary workarounds such as disabling vulnerable features or endpoints if feasible. 8. Educate administrators about phishing risks and safe handling of URLs and requests that could exploit this vulnerability.