CVE-2025-52668 is a vulnerability identified in the Revive Adserver software, specifically affecting versions 5.5.2, 6.0.1, and earlier. The flaw exists in the stats-conversions.php script due to improper input neutralization, which allows an attacker to inject malicious scripts that are stored and later executed in the context of users accessing the affected pages. This stored cross-site scripting (XSS) vulnerability can be exploited to disclose sensitive information such as session tokens or user data and hijack user sessions, compromising the integrity and confidentiality of the system. The vulnerability requires the attacker to have low privileges (PR:L) and some user interaction (UI:R), such as tricking a user into visiting a crafted URL or interacting with malicious content. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially compromised component. The CVSS 3.0 score of 8.7 indicates a high severity, with network attack vector (AV:N), low attack complexity (AC:L), and no impact on availability (A:N). No known exploits are currently reported in the wild, and no official patches have been released yet. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), a common and critical web security issue. Given the widespread use of Revive Adserver in digital advertising, this vulnerability poses a significant risk to organizations relying on it for ad delivery and analytics.

For European organizations, this vulnerability can lead to unauthorized disclosure of sensitive information and session hijacking, potentially allowing attackers to impersonate legitimate users or administrators. This can result in data breaches, loss of user trust, and manipulation of advertising metrics or content. Organizations operating public-facing ad servers or managing multiple clients' ad campaigns are particularly vulnerable, as exploitation could affect many users simultaneously. The compromise of session data may also facilitate further attacks within the organization's network. Additionally, the reputational damage and regulatory consequences under GDPR for failing to protect user data could be significant. The lack of available patches increases the risk window, necessitating immediate mitigation efforts. The impact is magnified in sectors heavily reliant on digital advertising, such as media, e-commerce, and marketing agencies.

Since no official patches are currently available, European organizations should implement strict input validation and sanitization on all user-supplied data, especially in the stats-conversions.php script and related components. Employing Content Security Policy (CSP) headers can help mitigate the impact of XSS by restricting script execution sources. Regularly audit and monitor web server logs for suspicious activity indicative of XSS exploitation attempts. Limit user privileges to the minimum necessary to reduce the attack surface. Consider isolating the ad server environment from critical internal networks to contain potential breaches. Educate users and administrators about phishing and social engineering tactics that could facilitate exploitation. Stay updated with vendor announcements for patches and apply them promptly once available. Additionally, deploying web application firewalls (WAFs) with rules targeting XSS payloads can provide a temporary protective layer.