CVE-2018-5263 in EasyDiscuss
Summary
by MITRE
The StackIdeas EasyDiscuss (aka com_easydiscuss) extension before 4.0.21 for Joomla! allows XSS.
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Analysis
by VulDB Data Team • 06/08/2025
The CVE-2018-5263 vulnerability represents a cross-site scripting flaw within the StackIdeas EasyDiscuss extension for Joomla websites to potential malicious exploitation through persistent or reflected XSS attacks. The vulnerability stems from inadequate input validation and output encoding mechanisms within the extension's codebase, specifically in how user-supplied data is processed and rendered within the web interface.
The technical flaw manifests when the EasyDiscuss extension fails to properly sanitize user inputs before displaying them in web pages. Attackers can craft malicious payloads that, when executed, can steal session cookies, redirect users to malicious sites, or execute unauthorized actions on behalf of authenticated users. This vulnerability operates under CWE-79 which categorizes cross-site scripting as a critical web application security weakness. The flaw enables attackers to inject malicious scripts into web pages viewed by other users, making it particularly dangerous in forum and discussion platform environments where user-generated content is prevalent.
The operational impact of this vulnerability extends beyond simple script execution, as it can lead to complete compromise of user sessions and potentially full system control. In Joomla forums for customer support or community engagement.
Security mitigations for CVE-2018-5263 primarily involve updating the EasyDiscuss extension to version 4.0.21 or later, which includes proper input sanitization and output encoding mechanisms. Organizations should also implement comprehensive web application firewalls to detect and block suspicious script injections, enforce strict content security policies to prevent unauthorized script execution, and conduct regular security audits of third-party extensions. The vulnerability aligns with ATT&CK technique T1566 which covers credential access through social engineering and malicious code injection. Additionally, implementing proper input validation frameworks and output encoding practices can prevent similar issues across other components of the Joomla extensions and core components to prevent exploitation of known vulnerabilities.