CVE-2026-78302 in SP Property Extension
Summary
by MITRE • 09/10/2026
Joomla Extension - joomshaper.com - Unauthenticated Stored Cross-Site Scripting (XSS) via Unescaped Output in Views and Admin Lists in SP Property < 4.1.4 - Multiple template files across frontend views and administrator list tables rendered attributes and text values directly into HTML without contextual escaping.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified as an unauthenticated stored cross-site scripting (XSS) flaw within the JoomShaper SP Property extension for Joomla versions prior to 4.1.4 represents a significant security risk due to its ability to execute arbitrary JavaScript code in the context of any user visiting affected pages or administrators viewing list tables. This issue stems from improper input validation and output encoding practices inherent in the development of the component, specifically within multiple template files that handle frontend views as well as administrator-side list displays. The core technical failure lies in the direct rendering of attributes and text values into HTML structures without applying contextual escaping mechanisms such as htmlspecialchars or equivalent sanitization functions provided by the Joomla framework. By failing to escape special characters like angle brackets, quotes, and ampersands before insertion into the DOM, the application allows maliciously crafted data stored within its database to be interpreted as executable code rather than static content when retrieved and displayed.
From a technical perspective, this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation known as cross-site scripting. The attack vector is particularly dangerous because it is classified as unauthenticated, meaning that an attacker does not need valid credentials to initiate the exploitation process. Furthermore, the stored nature of the XSS implies that the malicious payload persists in the application's database or configuration files until explicitly removed by a system administrator. This persistence ensures that every subsequent user who accesses the compromised view or list table will have their browser execute the injected script, thereby amplifying the potential impact across multiple victims without requiring repeated exploitation attempts for each target.
The operational impact of this vulnerability extends beyond simple defacement or cookie theft, although those remain primary concerns. Attackers can leverage stored XSS to perform session hijacking by stealing administrator cookies, potentially leading to full compromise of the Joomla backend and control over all website content and user data. Additionally, attackers may redirect users to phishing sites designed to harvest credentials for other services if single sign-on is in use, or they might deploy keyloggers to capture sensitive information entered into forms on the compromised site. In enterprise environments where this extension might be used for property listings containing user-submitted descriptions or comments, the risk of widespread compromise increases significantly as any registered user could potentially inject payloads through legitimate submission fields that are then rendered unsanitized by vulnerable template files.
Mitigation strategies must prioritize immediate remediation through software updates and rigorous input handling practices. The most effective solution is to upgrade the SP Property extension to version 4.1.4 or later, where these specific rendering flaws have been addressed by implementing proper output encoding in all affected frontend views and administrator list templates. For organizations unable to update immediately due to compatibility constraints with other components, temporary mitigations include enabling Content Security Policy headers that restrict script execution sources and disabling user-generated content input fields if they are not essential for business operations. Developers should also conduct a thorough audit of custom template overrides within the Joomla installation to ensure no additional unescaped outputs exist outside the core extension files. Regular security assessments and adherence to OWASP guidelines for web application security will help prevent similar vulnerabilities in future development cycles, ensuring that all dynamic content is treated as data rather than executable code until explicitly validated and sanitized through context-aware encoding methods.