CVE-2025-50052 is a high-severity vulnerability classified as CWE-79, indicating an improper neutralization of input during web page generation, commonly known as Cross-site Scripting (XSS). This vulnerability affects the product Flexo Counter developed by flexostudio, specifically versions up to 1.0001. The flaw allows an attacker to inject malicious scripts into web pages viewed by other users, exploiting reflected XSS vectors. Reflected XSS occurs when untrusted input is immediately returned by a web application without proper validation or encoding, enabling attackers to execute arbitrary JavaScript in the context of the victim's browser session. The CVSS v3.1 base score is 7.1, reflecting a high severity with the following vector: Network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), scope changed (S:C), and low impact on confidentiality, integrity, and availability (C:L/I:L/A:L). The scope change indicates that the vulnerability affects components beyond the initially vulnerable component, potentially impacting other parts of the system or user sessions. Although no known exploits are reported in the wild yet, the vulnerability's characteristics make it a viable target for attackers aiming to hijack user sessions, steal sensitive information, or perform actions on behalf of authenticated users. The lack of available patches at the time of publication necessitates immediate attention from organizations using Flexo Counter to mitigate risks.

For European organizations using Flexo Counter, this vulnerability poses a significant risk to web application security and user data confidentiality. Exploitation could lead to session hijacking, credential theft, unauthorized actions, and distribution of malware through trusted web interfaces. Given the reflected XSS nature, attacks typically require user interaction, such as clicking a malicious link, which could be facilitated through phishing campaigns targeting employees or customers. The impact extends to reputational damage, regulatory non-compliance (notably under GDPR due to potential data breaches), and operational disruptions. Organizations in sectors with high web application usage, such as e-commerce, finance, and public services, are particularly vulnerable. The scope change in the CVSS vector suggests that the vulnerability might affect multiple components or user roles, increasing the potential attack surface and impact severity. Additionally, the absence of known exploits does not preclude rapid weaponization, especially given the public disclosure and high CVSS score.

1. Immediate implementation of input validation and output encoding: Organizations should enforce strict input sanitization on all user-supplied data and apply context-appropriate output encoding to prevent script injection. 2. Deploy Web Application Firewalls (WAFs): Configure WAFs to detect and block common XSS attack patterns targeting Flexo Counter endpoints. 3. User awareness training: Educate users to recognize and avoid phishing attempts that could deliver malicious links exploiting this vulnerability. 4. Monitor and log web application traffic: Establish enhanced monitoring to detect anomalous requests indicative of exploitation attempts. 5. Isolate Flexo Counter instances: Where possible, run the application in segmented network zones to limit lateral movement if compromised. 6. Engage with flexostudio for patches or workarounds: Maintain communication with the vendor for timely updates or temporary mitigations. 7. Implement Content Security Policy (CSP): Deploy CSP headers to restrict the execution of unauthorized scripts in browsers. 8. Review and limit user privileges: Minimize the impact of potential exploitation by restricting user permissions within the application. These measures should be prioritized and combined to reduce the attack surface and mitigate exploitation risks effectively.