CVE-2026-116253 in DedeCMS
Summary
by MITRE • 10/26/2026
A vulnerability was determined in DedeCMS 5.7.118. This vulnerability affects the function common.inc.php::_RunMagicQuotes of the file plus/ad_js.php of the component Advertisement Rendering. Executing a manipulation of the argument aid can lead to code injection. The attack can be executed remotely.
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Analysis
by VulDB Data Team • 10/26/2026
The identified security flaw resides within DedeCMS version 5.7.118, specifically targeting the advertisement rendering subsystem which is responsible for dynamically generating and displaying ad content on web pages. This component relies heavily on user-supplied input to determine which advertisements or scripts should be rendered based on specific identifiers provided by the client request. The core of the vulnerability lies in the function _RunMagicQuotes located within the common.inc.php file, which is invoked during the processing of requests directed at plus/ad_js.php. Historically, functions with names implying magic quotes were designed to automatically escape special characters in input data to prevent injection attacks. However, in this specific implementation context, the logic fails to adequately sanitize or validate the aid argument before it is processed further by the application's internal rendering engine.
The technical nature of this vulnerability constitutes a code injection flaw, which aligns with CWE-94 Improper Control of Generation of Code (Code Injection). The root cause stems from insufficient validation and sanitization mechanisms applied to the aid parameter passed via HTTP requests. When an attacker manipulates this argument, they can inject malicious script content or server-side commands that are subsequently executed by the web application environment. Because the vulnerable function does not strictly enforce expected data types or patterns for the aid variable, it allows arbitrary code constructs to bypass security filters and enter the execution pipeline of the advertisement rendering module. This lack of input validation creates a direct pathway for an attacker to compromise the integrity of the server-side processing logic.
From an operational perspective, this vulnerability poses a severe risk as it can be exploited remotely without requiring any form of authentication or prior user interaction beyond sending a crafted HTTP request. An adversary with network access to the target system can leverage this flaw to achieve arbitrary code execution on the web server hosting DedeCMS. The impact extends far beyond simple data leakage; successful exploitation allows attackers to take full control over the underlying operating system, install backdoors, pivot into internal networks, or deface the website by injecting malicious scripts that execute in the context of other users' browsers if cross-site scripting vectors are also triggered through the rendered output. This significantly undermines the confidentiality, integrity, and availability of the affected information systems.
To mitigate this risk, immediate remediation is required at both the application level and infrastructure layer. The primary fix involves updating DedeCMS to a patched version where the _RunMagicQuotes function has been corrected or replaced with robust input validation practices that strictly whitelist allowed characters for the aid parameter. In cases where an update is not immediately feasible, administrators should implement web application firewall rules to detect and block requests containing suspicious patterns associated with code injection attempts targeting the plus/ad_js.php endpoint. Additionally, disabling unnecessary advertisement rendering modules if they are not actively used can reduce the attack surface by removing access to the vulnerable code path entirely. Regular security audits and penetration testing focusing on input validation weaknesses in CMS components are recommended to prevent similar vulnerabilities from being exploited in the future. This incident highlights the critical importance of adhering to secure coding standards such as those outlined in OWASP guidelines for preventing injection flaws, ensuring that all user inputs are treated as untrusted until explicitly validated against strict criteria.