Overview
In the ever-evolving landscape of cybersecurity, new vulnerabilities continue to emerge, posing significant threats to both individual users and large-scale organizations. One such vulnerability, CVE-2025-26855, has been identified in the Joomla content management system’s Articles Calendar extension. Specifically, versions 1.0.0 to 1.0.1.0007 of the extension are susceptible to SQL injection attacks, which can potentially lead to system compromise or data leakage. This vulnerability carries a high severity rating, making it a critical area of focus for anyone using the affected extension.
Vulnerability Summary
CVE ID: CVE-2025-26855
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, data leakage
Affected Products
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Product | Affected Versions
Articles Calendar extension for Joomla | 1.0.0 – 1.0.1.0007
How the Exploit Works
The exploit takes advantage of a flaw in the Articles Calendar extension for Joomla, which fails to properly sanitize user inputs in SQL queries. This allows an attacker to inject malicious SQL code into the application, which can then be executed by the database management system. This could potentially lead to unauthorized access to sensitive data, manipulation of said data, or even complete control over the affected system.
Conceptual Example Code
Here’s a high-level conceptual example of how this type of SQL injection vulnerability could be exploited:
POST /index.php?option=com_articlescalendar&view=articlescalendar HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
id=1 UNION SELECT 1,username,password FROM #__usersIn this example, the malicious SQL code (1 UNION SELECT 1,username,password FROM #__users) is injected into the ‘id’ parameter of the POST request. This results in the execution of an additional SQL query, which could potentially retrieve sensitive user information from the database.
Mitigation
To mitigate this vulnerability, users are advised to apply the vendor’s patch as soon as possible. In the absence of a patch or until one can be applied, users may consider using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation measure. These tools can help to detect and block malicious SQL code, thereby preventing exploitation of this vulnerability.