CVE-2018-15899 in miniCMS
Summary
by MITRE
An issue was discovered in MiniCMS 1.10. There is a post.php?date= XSS vulnerability.
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Analysis
by VulDB Data Team • 02/13/2026
The vulnerability identified as CVE-2018-15899 represents a cross-site scripting flaw within MiniCMS version 1.10, specifically manifesting in the post.php script when processing the date parameter. This issue falls under the category of insecure data handling and improper input validation, which are fundamental weaknesses in web application security. The vulnerability allows attackers to inject malicious scripts into web pages viewed by other users, creating a significant risk to the application's integrity and user safety. The flaw exists because the application fails to properly sanitize or escape user-supplied input before incorporating it into dynamic web content, making it susceptible to exploitation through crafted malicious payloads.
The technical implementation of this vulnerability stems from the application's failure to validate or sanitize the date parameter passed through the post.php script. When a user submits data containing malicious script code within the date field, the application processes this input without adequate filtering mechanisms. This lack of input sanitization creates an environment where attacker-controlled content can be executed in the context of other users' browsers. The vulnerability is classified as a reflected cross-site scripting issue since the malicious payload is reflected back to users through the application's response. According to CWE guidelines, this maps directly to CWE-79 which describes improper neutralization of input during web page generation, making it a well-documented and widely recognized security weakness.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it can enable attackers to perform a wide range of malicious activities. An attacker could exploit this flaw to steal user credentials, manipulate session tokens, redirect users to malicious websites, or even execute arbitrary commands on affected systems. The vulnerability particularly affects users who have administrative privileges or access to sensitive content within the MiniCMS environment. Given that this is a reflected XSS vulnerability, attackers can craft malicious URLs that, when clicked by victims, automatically execute the injected scripts without requiring persistent access to the application's server. This makes the vulnerability particularly dangerous in environments where users frequently click on links from untrusted sources.
Mitigation strategies for CVE-2018-15899 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The most effective immediate solution involves sanitizing all user inputs, particularly those used in dynamic content generation, and ensuring proper HTML encoding of output before rendering. Organizations should implement Content Security Policy headers to limit the execution of unauthorized scripts and consider using web application firewalls to detect and block malicious payloads. Additionally, regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other application components. This vulnerability aligns with ATT&CK technique T1059.005 which covers command and scripting interpreter for execution, as the XSS payload could potentially be used to establish command execution capabilities. The remediation process should also include updating the MiniCMS application to a patched version that properly handles user input validation, as the vendor would have likely addressed this issue in subsequent releases.