CVE-2025-26882 identifies a stored cross-site scripting vulnerability in the GhozyLab Popup Builder plugin, specifically versions up to and including 1.1.33. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is stored and later executed in the browsers of users who visit the affected pages. Stored XSS is particularly dangerous because the malicious payload persists on the server and is served to multiple users, increasing the attack surface. This flaw can be exploited by an attacker who submits crafted input through the plugin’s interface or any input fields it processes, which is then embedded in popup content without proper sanitization or encoding. When other users load the popup, the malicious script executes in their browsers with the privileges of the affected website, potentially leading to session hijacking, credential theft, defacement, or distribution of malware. The vulnerability affects the Popup Builder plugin, a popular WordPress tool used to create popups for notifications, promotions, or user engagement. No official patch or fix link is provided yet, and no known exploits have been reported in the wild as of the publication date. The vulnerability was reserved and published in February 2025 by Patchstack. The lack of a CVSS score requires an independent severity assessment based on the nature of stored XSS vulnerabilities, which are generally considered high risk due to their impact and ease of exploitation.

The impact of CVE-2025-26882 on organizations worldwide can be significant. Stored XSS vulnerabilities allow attackers to execute arbitrary scripts in the context of the affected website, compromising user sessions and potentially leading to unauthorized access to sensitive information. This can result in data breaches, loss of customer trust, and reputational damage. For e-commerce, financial, or healthcare websites using the Popup Builder plugin, the consequences could include theft of personal data, fraudulent transactions, or regulatory penalties. Additionally, attackers could use the vulnerability to distribute malware or conduct phishing attacks by injecting deceptive content. Since the vulnerability is stored, it affects all users who view the compromised popup, amplifying the scope of impact. The absence of known exploits currently provides a window for organizations to remediate before active attacks emerge. However, the widespread use of WordPress and its plugins globally means many websites could be vulnerable, especially those that have not updated or do not have robust input validation controls.

To mitigate CVE-2025-26882, organizations should first check for updates or patches from GhozyLab and apply them immediately once available. In the absence of an official patch, administrators should consider disabling the Popup Builder plugin temporarily or removing it if it is not critical to operations. Implementing web application firewalls (WAFs) with rules to detect and block XSS payloads can provide interim protection. Additionally, reviewing and sanitizing all user inputs processed by the plugin using secure coding practices is essential. Employing Content Security Policy (CSP) headers can help mitigate the impact of XSS by restricting script execution sources. Regular security audits and penetration testing focused on input validation and output encoding should be conducted to identify similar vulnerabilities. Educating developers and administrators about secure input handling and the risks of stored XSS will help prevent future occurrences. Monitoring web traffic and logs for suspicious activity related to popup content can aid in early detection of exploitation attempts.