CVE-2013-2695 in WP Symposium
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in invite.php in the WP Symposium plugin before 13.04 for WordPress allows remote attackers to inject arbitrary web script or HTML via the u parameter.
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Analysis
by VulDB Data Team • 05/09/2026
The CVE-2013-2695 vulnerability represents a classic cross-site scripting flaw within the WP Symposium plugin for WordPress, specifically affecting versions prior to 13.04. This vulnerability exists in the invite.php script and allows remote attackers to execute malicious web scripts or HTML code through manipulation of the u parameter. The WP Symposium plugin is a popular social networking solution for WordPress that enables users to create community platforms with features including user profiles, messaging, and social interactions. The vulnerability stems from inadequate input validation and output sanitization within the plugin's invitation functionality, creating a persistent security weakness that can be exploited by malicious actors without requiring authentication or privileged access.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing specially formatted input in the u parameter of the invite.php endpoint. When a victim visits this crafted link, the malicious script or HTML code executes within the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. This XSS vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws in software applications. The vulnerability's impact is particularly concerning given that WordPress plugins often operate with elevated privileges and can access sensitive user data, making the exploitation of such flaws potentially devastating for site administrators and their users.
The operational impact of CVE-2013-2695 extends beyond simple script execution, as it can enable sophisticated attack vectors including credential harvesting through session manipulation, data exfiltration, and establishment of persistent backdoors within the compromised WordPress environment. Attackers can leverage this vulnerability to target the social networking features of the WP Symposium plugin, potentially compromising user accounts and spreading malicious payloads throughout the community. The vulnerability's remote nature means that exploitation can occur without direct user interaction beyond clicking a malicious link, making it particularly dangerous in social media contexts where users frequently share links. This aligns with ATT&CK technique T1566 which covers phishing and social engineering tactics that exploit web application vulnerabilities.
Mitigation strategies for CVE-2013-2695 require immediate action to upgrade the WP Symposium plugin to version 13.04 or later, where the vulnerability has been patched through proper input sanitization and output encoding. Organizations should also implement comprehensive web application firewall rules to detect and block malicious input patterns targeting the u parameter in the invite.php script. Additional defensive measures include regular security auditing of WordPress plugins, implementation of Content Security Policy headers, and user education regarding suspicious links. The vulnerability demonstrates the critical importance of keeping WordPress plugins updated and highlights the necessity of input validation at multiple layers within web applications, as recommended by OWASP Top 10 and other industry security standards. Security teams should also monitor for similar vulnerabilities in other WordPress plugins and maintain automated scanning processes to identify and remediate such issues before they can be exploited by threat actors.