CVE-2026-76783 in DeDeCMS
Summary
by MITRE • 08/20/2026
A security vulnerability has been detected in DeDeCMS 53_1_UTF8. This vulnerability affects unknown code of the file /plus/advancedsearch.php. Such manipulation of the argument sql leads to sql injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/20/2026
The identified security flaw resides within DeDeCMS version 53_1_UTF8, specifically targeting the advanced search functionality implemented in the /plus/advancedsearch.php script. This vulnerability represents a critical failure in input validation and query construction mechanisms, allowing an attacker to inject malicious Structured Query Language commands directly into database operations. The root cause is traced to improper handling of the sql argument passed through HTTP requests. When this parameter is processed by the application backend, it fails to adequately sanitize or escape user-supplied data before incorporating it into dynamic SQL queries. This lack of robust input filtering creates a direct pathway for attackers to manipulate the intended database logic, bypassing authentication controls and extracting sensitive information from the underlying database system.
From an operational perspective, this vulnerability enables remote code execution at the database level without requiring prior authentication in many configurations, although some variants may require specific context depending on server settings. The ability to perform SQL injection allows adversaries to read arbitrary data, modify existing records, or even execute administrative commands if the database user has elevated privileges. This can lead to complete compromise of the web application's integrity and confidentiality. Attackers can leverage this flaw to dump user credentials, personal identifiable information, and other critical business data stored within the CMS database. The public disclosure of exploit code significantly lowers the barrier for entry, enabling less sophisticated threat actors to launch automated attacks against vulnerable instances across the internet.
This vulnerability aligns with CWE-89 Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. It also maps to MITRE ATT&CK technique T1059 Command and Scripting Interpreter if the injection leads to further system compromise, or more directly to data exfiltration techniques such as T1005 Data from Local System when attackers extract database contents. The remote nature of the exploit means it can be triggered over standard web protocols like HTTP or HTTPS, making it a high-risk issue for any publicly accessible DeDeCMS deployment running this specific version.
Mitigation strategies must focus on immediate remediation and defensive hardening. The most effective solution is to apply the official security patch provided by DeDeCMS developers if available for version 53_1_UTF8. If no direct patch exists, administrators should consider upgrading to a newer, supported version of the CMS where input validation has been strengthened. In the interim, implementing Web Application Firewall rules can help detect and block SQL injection patterns targeting the /plus/advancedsearch.php endpoint. Additionally, developers must ensure that all database interactions use parameterized queries or prepared statements rather than string concatenation for building SQL commands. This practice ensures that user input is treated strictly as data rather than executable code, effectively neutralizing this class of vulnerability at its source.