CVE-2025-54740 is a Stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Michael Nelson Print My Blog software up to version 3.27.9. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and subsequently executed in the context of users visiting affected pages. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The attack vector is network-based (AV:N), requiring low attack complexity (AC:L), but it does require privileges (PR:L) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact metrics indicate low confidentiality (C:L), integrity (I:L), and availability (A:L) impacts. Stored XSS vulnerabilities can enable attackers to execute arbitrary JavaScript in the victim’s browser, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. Since this is a stored XSS, the malicious payload is saved on the server and delivered to multiple users, increasing the attack surface. The vulnerability affects the Print My Blog product, a tool used for exporting or printing blog content, which may be deployed in various organizational contexts. No known exploits are reported in the wild at this time, and no patches or fixes have been linked yet. The vulnerability was reserved on 2025-07-28 and published on 2025-08-14, indicating recent disclosure.

For European organizations using Print My Blog, this vulnerability poses a risk primarily to web application security and user data confidentiality. Exploitation could lead to unauthorized script execution in users’ browsers, enabling attackers to steal session cookies, perform actions on behalf of users, or deliver further malware. This can impact internal users or customers interacting with the vulnerable application. While the direct impact on system availability is low, the reputational damage and potential regulatory consequences under GDPR for data breaches involving personal data could be significant. Organizations in sectors with high reliance on web content management and publishing, such as media, education, and government, may face elevated risks. The requirement for user interaction and privileges limits exploitation to some extent, but insider threats or compromised accounts could facilitate attacks. The scope change indicates that the vulnerability could affect components beyond the immediate application, potentially impacting integrated systems or services.

Organizations should prioritize the following mitigation steps: 1) Implement strict input validation and output encoding on all user-supplied content within Print My Blog to neutralize malicious scripts. 2) Apply Content Security Policy (CSP) headers to restrict execution of unauthorized scripts in browsers. 3) Limit user privileges to the minimum necessary to reduce the risk of exploitation requiring privileges. 4) Monitor and audit logs for unusual script injection attempts or anomalous user behavior. 5) Educate users about the risks of interacting with untrusted content and encourage cautious behavior. 6) Engage with the vendor or community to obtain patches or updates addressing this vulnerability as soon as they become available. 7) If feasible, isolate the Print My Blog application environment to limit lateral movement in case of compromise. 8) Conduct regular security assessments and penetration testing focusing on XSS vulnerabilities in web applications.