CVE-2025-57950 is a medium-severity vulnerability classified under CWE-79, which pertains to Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting (XSS). This vulnerability affects the Glen Scott Plugin Security Scanner product, specifically versions up to 2.0.2. The issue allows for Stored XSS attacks, meaning that malicious input submitted by an attacker is stored by the application and later rendered in web pages without proper sanitization or encoding. When a victim user accesses the affected page, the malicious script executes in their browser context. The CVSS 3.1 base score is 5.9, reflecting a medium impact with the vector AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L. This indicates the attack can be performed remotely over the network with low attack complexity but requires high privileges and user interaction. The scope is changed (S:C), meaning the vulnerability affects resources beyond the vulnerable component. The impact on confidentiality, integrity, and availability is limited but present, as the attacker can execute scripts that may steal session tokens, manipulate displayed content, or perform actions on behalf of the user. No known exploits are currently reported in the wild, and no patches or mitigation links have been published yet. The vulnerability arises from insufficient input validation and output encoding during web page generation within the Plugin Security Scanner interface or reporting features, allowing malicious payloads to be stored and later executed in users' browsers.

For European organizations using Glen Scott Plugin Security Scanner, this vulnerability poses a risk primarily to the confidentiality and integrity of data accessed through the scanner's web interface. Since the vulnerability requires high privileges to exploit and user interaction, the threat is more significant in environments where multiple users with elevated privileges access the scanner's web UI. An attacker who gains access to a privileged account could inject malicious scripts that execute when other privileged users view affected pages, potentially leading to session hijacking, unauthorized actions within the scanner, or lateral movement within the network. This could undermine trust in the security scanning process, lead to leakage of sensitive vulnerability data, or disrupt vulnerability management workflows. The availability impact is limited but possible if the injected scripts perform disruptive actions. European organizations with strict data protection regulations (e.g., GDPR) must consider the risk of data leakage and unauthorized access resulting from such XSS vulnerabilities, as this could lead to compliance issues and reputational damage.

1. Immediate mitigation should include restricting access to the Plugin Security Scanner web interface to trusted, authenticated users only, minimizing exposure. 2. Implement strict input validation and output encoding on all user-supplied data rendered in the web interface, especially in areas where plugin or scan results are displayed. 3. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in the browser context. 4. Monitor and audit user activities within the scanner to detect suspicious behavior indicative of exploitation attempts. 5. Segregate roles and minimize the number of users with high privileges to reduce the risk of exploitation. 6. Until an official patch is released, consider disabling or limiting features that accept user input or display dynamic content in the scanner interface. 7. Educate users with access to the scanner about the risks of clicking on suspicious links or executing untrusted scripts. 8. Regularly check for updates from Glen Scott and apply patches promptly once available.