CVE-2025-54266 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Commerce versions 2.4.9-alpha2, 2.4.8-p2, 2.4.7-p7, 2.4.6-p12, 2.4.5-p14, 2.4.4-p15, and earlier. The vulnerability arises from insufficient sanitization of user input in certain form fields, allowing a high-privileged attacker (such as an administrator or trusted user) to inject malicious JavaScript code that is persistently stored on the server. When other users visit the affected page containing the injected script, the malicious code executes in their browsers, potentially leading to session hijacking, data theft, or unauthorized actions performed on behalf of the victim. Exploitation requires the attacker to have high privileges to inject the payload and requires victims to interact by visiting the compromised page. The vulnerability changes the security scope, indicating that the impact extends beyond the initial attacker to other users. The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N) indicates network attack vector, low attack complexity, high privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity, with no impact on availability. No public exploits or patches are currently available, but the vulnerability is publicly disclosed and should be addressed promptly.

For European organizations, especially those operating e-commerce platforms using Adobe Commerce, this vulnerability poses a risk of client-side attacks that can compromise user data confidentiality and integrity. Attackers with administrative or high-level access could inject malicious scripts that execute in the browsers of customers or employees, potentially leading to credential theft, session hijacking, or unauthorized transactions. This can damage brand reputation, lead to regulatory non-compliance (e.g., GDPR violations due to data leakage), and cause financial losses. Since exploitation requires user interaction, social engineering or phishing may be used to lure victims to the malicious pages. The medium severity reflects that while the vulnerability is not trivially exploitable by unauthenticated attackers, the consequences for affected users can be significant. The impact is particularly critical for organizations with large user bases or sensitive customer data.

1. Apply official Adobe Commerce patches immediately once released to address CVE-2025-54266. 2. Until patches are available, restrict high-privileged user access to trusted personnel only and monitor for suspicious activity. 3. Implement strict input validation and output encoding on all form fields to prevent injection of malicious scripts. 4. Deploy Content Security Policy (CSP) headers to restrict execution of unauthorized scripts in browsers. 5. Conduct regular security audits and penetration testing focusing on XSS vulnerabilities. 6. Educate users and administrators about phishing and social engineering risks to reduce the chance of victim interaction with malicious pages. 7. Monitor web application logs for unusual input patterns or script injections. 8. Consider web application firewalls (WAF) with XSS detection and blocking capabilities as an interim protective measure.