CVE-2025-67620 identifies a reflected Cross-site Scripting (XSS) vulnerability in CleverSoft's Anon product, specifically versions up to and including 2.2.10. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious scripts that are reflected back to users. When a victim interacts with a crafted URL or input, the malicious script executes in their browser context, potentially leading to session hijacking, theft of sensitive information, or execution of unauthorized actions on behalf of the user. The vulnerability does not require any privileges (AV:N - network attack vector) and has low attack complexity (AC:L), but it does require user interaction (UI:R), such as clicking a malicious link. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the vulnerable component. The impact affects confidentiality, integrity, and availability to a low but significant degree (C:L/I:L/A:L). Although no known exploits are currently reported in the wild, the presence of this vulnerability in a web-facing application used by organizations poses a substantial risk. The lack of available patches at the time of reporting necessitates immediate interim mitigations, including strict input validation, output encoding, and user awareness to avoid clicking suspicious links. The vulnerability was reserved in December 2025 and published in January 2026, indicating recent discovery and disclosure. CleverSoft Anon is a web application product, and its adoption in various sectors, including potentially critical infrastructure, increases the importance of addressing this issue promptly.

For European organizations, this vulnerability presents a significant risk due to the widespread use of web applications and the potential for attackers to exploit reflected XSS to compromise user sessions, steal credentials, or perform unauthorized actions. The impact extends to loss of confidentiality of sensitive data, integrity violations through unauthorized commands executed in user context, and availability disruptions if attackers leverage the vulnerability for denial-of-service or further attacks. Organizations in sectors such as finance, healthcare, government, and critical infrastructure that rely on CleverSoft Anon for web services could face reputational damage, regulatory penalties under GDPR for data breaches, and operational disruptions. The requirement for user interaction means phishing campaigns could be used to exploit this vulnerability, increasing the attack surface. The lack of known exploits currently provides a window for proactive defense, but the high CVSS score and scope change indicate that the vulnerability could be leveraged for significant lateral movement or privilege escalation within affected environments.

1. Immediate implementation of strict input validation and output encoding on all user-supplied data within the Anon application to prevent script injection. 2. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3. Educate users and employees about the risks of clicking on suspicious links or interacting with untrusted inputs to reduce the likelihood of successful exploitation. 4. Monitor web application logs for unusual or suspicious input patterns that may indicate attempted exploitation. 5. Once available, promptly apply official patches or updates from CleverSoft addressing this vulnerability. 6. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block reflected XSS payloads targeting Anon. 7. Conduct regular security assessments and penetration testing focused on input handling and XSS vulnerabilities in the Anon environment. 8. Isolate critical systems running Anon to limit the potential impact of a successful attack. 9. Review and harden session management mechanisms to mitigate session hijacking risks. 10. Maintain up-to-date backups and incident response plans to quickly recover from any compromise.