CVE-2026-85192 in Conditional Content Pro Extension
Summary
by MITRE • 09/14/2026
Joomla Extension - regularlabs.com - Authenticated, privileged remote code execution in Conditional Content extension for Joomla < 8.0.0 - Conditional Content Pro accepts inline PHP Condition Rules in article syntax. In affected versions, the PHP is passed to the Conditions evaluator without checking who authored the article. Joomla's normal Author text filter preserves the syntax, so publishing the article causes the code to run as the web-server process.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified involves a critical authenticated remote code execution flaw within the Conditional Content extension for Joomla, specifically in versions prior to 8.0.0 developed by regularlabs.com. This security issue stems from an improper restriction of administrative functionality and insufficient validation of user-supplied input during the processing of article content. The core technical failure lies in how the extension handles inline PHP Condition Rules embedded within article syntax. When a user submits an article containing these rules, the system passes the PHP code directly to its internal Conditions evaluator without performing any verification regarding the authorship or privilege level of the individual who created the content. This design oversight allows malicious actors with authenticated access and publishing privileges to inject arbitrary server-side scripts that are executed immediately upon publication.
From a technical perspective, this flaw represents a classic case of insecure direct object references combined with code injection vulnerabilities. The Joomla platform typically employs an Author text filter designed to strip or escape dangerous HTML tags and potentially harmful script content from user inputs to prevent cross-site scripting and other client-side attacks. However, in the context of this specific extension, the filtering mechanism preserves the PHP syntax rather than neutralizing it. Consequently, when the article is published, the web server process interprets and executes the injected code with its own elevated privileges. This effectively bypasses standard security controls that rely on input sanitization for general content fields, as the application explicitly trusts the conditional logic engine to handle raw executable code without additional context-aware validation.
The operational impact of this vulnerability is severe, granting attackers full remote code execution capabilities under the identity of the web server process. Depending on the configuration and permissions of the hosting environment, an attacker can read sensitive files such as database credentials or configuration settings, modify website content to deface the site, install backdoors for persistent access, or pivot further into internal network infrastructure. Because authentication is required, this vulnerability typically affects sites where users have been granted author-level privileges. However, if these accounts are compromised through weak passwords, credential stuffing, or other means, the attacker can escalate their position from a standard user to a system administrator equivalent in terms of code execution power. This aligns with common attack patterns observed in web application exploitation where initial access is gained through valid credentials and then escalated via misconfigured extensions.
In terms of industry standards classification, this vulnerability maps directly to CWE-94 Improper Control of Generation of Code (Code Injection) as the primary weakness, specifically involving server-side code execution. It also relates to CWE-269 Improvement of Privilege Control regarding the unauthorized elevation of privileges through trusted subsystems and CWE-78 Improper Neutralization of Special Elements used in an OS Command if shell commands are invoked via the PHP execution. From a tactical perspective within the MITRE ATT&CK framework, this exploit facilitates Initial Access by leveraging valid credentials and Execution techniques such as Server-Side Scripting Interpreter or Operating System Command Injection depending on how the injected code is structured to interact with the underlying system.
Mitigation strategies must focus on immediate remediation of the software version and enhanced input validation practices. The most effective solution is to upgrade the Conditional Content extension to version 8.0.0 or later, where this specific logic flaw has been addressed by implementing stricter authorship verification before processing conditional rules. Administrators should also review user roles and permissions within Joomla to ensure that only trusted individuals with a legitimate need for publishing content are granted those privileges. Implementing Web Application Firewalls can provide an additional layer of defense by detecting and blocking requests containing suspicious PHP syntax patterns in article bodies, although this is not a substitute for patching the underlying vulnerability. Regular security audits and penetration testing should be conducted to identify similar misconfigurations in other third-party extensions that may expose the application to comparable risks.