CVE-2025-58876 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Aparat Video Shortcode plugin developed by Ali Aghdam. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious scripts to be injected and stored within the application. When a victim accesses the affected page, the malicious script executes in their browser context. The vulnerability affects versions up to 0.2.4 of the Aparat Video Shortcode plugin. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) reveals that the attack can be performed remotely over the network with low attack complexity, requires privileges (PR:L) and user interaction (UI:R), and impacts confidentiality, integrity, and availability to a limited extent but with scope change (S:C). Stored XSS vulnerabilities are particularly dangerous because they allow persistent injection of malicious code that can affect multiple users, potentially leading to session hijacking, credential theft, defacement, or distribution of malware. The lack of a patch link suggests that a fix may not yet be publicly available, increasing the urgency for mitigation. No known exploits are reported in the wild at this time, but the presence of this vulnerability in a web plugin used to embed video content means it could be leveraged to target websites that rely on this plugin for multimedia content integration.

For European organizations, the impact of this vulnerability can be significant, especially for those using WordPress or similar CMS platforms with the Aparat Video Shortcode plugin installed. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information, or manipulation of website content, undermining user trust and potentially violating data protection regulations such as GDPR. The scope change in the CVSS vector indicates that the vulnerability could affect resources beyond the initially vulnerable component, potentially compromising broader parts of the web application. This could result in reputational damage, legal consequences, and financial losses. Organizations in sectors with high web presence, such as e-commerce, media, and public services, are particularly at risk. Additionally, since the vulnerability requires some level of privilege and user interaction, insider threats or targeted phishing campaigns could facilitate exploitation. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the potential for future attacks once exploit code becomes available.

Given the absence of an official patch, European organizations should implement immediate compensating controls. First, restrict plugin usage to trusted administrators and limit privileges to reduce the risk of malicious input submission. Employ Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the Aparat Video Shortcode plugin. Conduct thorough input validation and output encoding on any user-supplied data related to video shortcode parameters, even if this requires custom development or temporary plugin modification. Monitor web server and application logs for suspicious activity indicative of XSS attempts. Educate users and administrators about the risks of clicking on untrusted links or interacting with suspicious content, as user interaction is required for exploitation. Plan for prompt patch deployment once an official fix is released by the vendor. Additionally, consider isolating or disabling the plugin if it is not essential to reduce the attack surface. Regular security assessments and penetration testing focusing on XSS vulnerabilities in web plugins should be conducted to proactively identify and remediate similar issues.