CVE-2024-39143 is a stored cross-site scripting (XSS) vulnerability identified in ResidenceCMS version 2.10.1. This vulnerability arises because the application fails to properly sanitize or encode user-supplied HTML content submitted by low-privilege users when creating or editing property listings. As a result, an attacker with low-level access can embed malicious HTML or JavaScript code into property content fields. When other users, including administrators or authenticated users, view the affected property pages, the malicious script executes in their browsers within the security context of the ResidenceCMS domain. This can lead to session hijacking, credential theft, unauthorized actions, or defacement. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The CVSS v3.1 base score is 5.4, reflecting network attack vector, low attack complexity, low privileges required, user interaction needed, and partial impact on confidentiality and integrity but no impact on availability. No official patches or exploit code have been reported yet. The vulnerability’s scope is limited to ResidenceCMS installations running version 2.10.1 or similar unpatched versions. The flaw highlights inadequate input validation and output encoding in the CMS’s content management features.

The primary impact of CVE-2024-39143 is the potential compromise of user confidentiality and integrity within ResidenceCMS environments. Attackers can steal session cookies or authentication tokens, enabling account takeover or privilege escalation. They may also perform unauthorized actions on behalf of victims, such as modifying content or accessing sensitive data. While availability is not affected, the reputational damage and data leakage risks are significant for organizations managing real estate listings or property management portals. Since the vulnerability requires user interaction, social engineering or phishing may be used to lure victims to malicious property pages. Organizations worldwide using ResidenceCMS 2.10.1, especially those with many users or sensitive data, face increased risk of targeted attacks. The absence of known exploits in the wild currently limits immediate widespread impact, but the vulnerability remains a credible threat if weaponized.

To mitigate CVE-2024-39143, organizations should prioritize upgrading ResidenceCMS to a patched version once available. In the absence of official patches, implement strict input validation to disallow or sanitize HTML tags and scripts in property content fields. Employ robust output encoding (e.g., HTML entity encoding) when rendering user-generated content to prevent script execution. Use Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce XSS impact. Conduct regular security audits and penetration testing focused on input handling. Limit user privileges to the minimum necessary and monitor logs for suspicious content submissions. Educate users about the risks of clicking untrusted links within the CMS. Additionally, consider deploying web application firewalls (WAFs) with XSS detection rules tailored to ResidenceCMS traffic patterns. These combined measures reduce the likelihood and impact of exploitation.