CVE-2025-52462 is a cross-site scripting (XSS) vulnerability identified in QUALITIA CO., LTD.'s Active! mail 6 product, specifically affecting versions from BuildInfo 6.30.01004145 through 6.60.06008562. The vulnerability allows an attacker to execute arbitrary scripts in the context of a logged-in user's web browser by tricking the user into accessing a specially crafted URL. This type of vulnerability is classified as a reflected or stored XSS, depending on the injection vector, but the description suggests it is triggered when a user accesses a malicious URL, indicating a reflected XSS scenario. The CVSS 3.0 base score is 6.1, which corresponds to a medium severity rating. The vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) indicates that the attack can be performed remotely over the network without privileges and with low attack complexity, but requires user interaction (clicking the malicious URL). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact affects confidentiality and integrity to a limited extent but does not affect availability. Exploiting this vulnerability could allow attackers to steal session cookies, perform actions on behalf of the user, or manipulate displayed content, potentially leading to further compromise or data leakage within the affected mail system. No known exploits are currently reported in the wild, and no patches or mitigation links are provided in the source data, indicating that organizations using affected versions should prioritize remediation once available. The vulnerability was published on July 2, 2025, with the initial reservation date on June 18, 2025, by the Japanese Computer Emergency Response Team (JPCERT).

For European organizations, the impact of this XSS vulnerability in Active! mail 6 could be significant, especially for entities relying on this mail system for internal and external communications. Successful exploitation could lead to unauthorized disclosure of sensitive information such as emails, contacts, or internal communications through session hijacking or cookie theft. It could also enable attackers to perform actions on behalf of users, potentially leading to phishing, spreading malware, or unauthorized access to other internal systems. Given that Active! mail is an enterprise-grade mail solution, organizations in sectors like finance, government, healthcare, and critical infrastructure could face reputational damage, regulatory penalties (e.g., under GDPR for data breaches), and operational disruptions. The requirement for user interaction (clicking a malicious link) means that social engineering or phishing campaigns could be used to exploit this vulnerability, increasing the risk in environments with less mature security awareness. The scope change in the CVSS vector suggests that the vulnerability could impact multiple components or users beyond the initially targeted system, amplifying the potential damage within an organization.

Organizations should immediately identify if they are running affected versions of Active! mail 6 (BuildInfo 6.30.01004145 to 6.60.06008562). Until an official patch is released, the following specific mitigations are recommended: 1) Implement strict input validation and output encoding on all user-supplied data within the mail application to prevent script injection. 2) Deploy Web Application Firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the XSS vectors in Active! mail. 3) Educate users about the risks of clicking on unsolicited or suspicious URLs, especially those received via email. 4) Use Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context. 5) Monitor logs for unusual URL access patterns that could indicate exploitation attempts. 6) Segment the mail system network to limit lateral movement if a compromise occurs. 7) Prepare for rapid patch deployment once QUALITIA releases an official fix. These targeted actions go beyond generic advice by focusing on the specific nature of the vulnerability and the affected product environment.