CVE-2025-26950 in Nepali Date Converter Plugin
Summary
by MITRE • 04/16/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in AddonsPress Nepali Date Converter allows Stored XSS. This issue affects Nepali Date Converter: from n/a through 2.0.8.
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Analysis
by VulDB Data Team • 04/16/2025
This vulnerability represents a critical cross-site scripting flaw in the AddonsPress Nepali Date Converter plugin, specifically within the stored XSS attack vector. The weakness occurs during the web page generation process where user input is not properly sanitized or escaped before being rendered back to users. This allows an attacker to inject malicious scripts that persist in the application's database and execute whenever affected pages are loaded. The vulnerability affects all versions of the plugin up to and including version 2.0.8, indicating a long-standing issue that has not been addressed in the codebase.
The technical implementation of this flaw stems from inadequate input validation and output encoding practices within the plugin's processing pipeline. When users submit data through the plugin interface, particularly when converting dates or entering content that gets stored in the database, the application fails to properly neutralize potentially dangerous characters and script tags. This creates an environment where malicious actors can embed javascript code that will execute in the context of other users' browsers. The stored nature of this vulnerability means that once malicious input is accepted and saved, it continues to pose a threat to all users who view the affected content without any additional interaction required from them.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform a wide range of malicious activities including session hijacking, credential theft, data exfiltration, and redirection to malicious sites. An attacker who successfully exploits this vulnerability could gain access to user sessions, steal sensitive information, or manipulate the functionality of the website. The stored XSS nature makes this particularly dangerous because the malicious code persists even after the initial injection, meaning the attack can continue to affect users long after the initial compromise. This vulnerability directly maps to CWE-79 which defines the improper neutralization of input during web page generation, and aligns with ATT&CK technique T1531 which involves manipulation of web content to achieve unauthorized access or data theft.
Mitigation strategies should include immediate implementation of proper input sanitization and output encoding mechanisms throughout the plugin's codebase. All user-supplied input must be validated against a strict whitelist of acceptable characters and patterns, with any potentially dangerous content properly escaped before storage or display. The plugin should implement Content Security Policy headers to limit script execution and prevent unauthorized code injection. Additionally, developers should conduct comprehensive code reviews focusing on all input handling points and implement automated security testing including dynamic application security testing and static code analysis. Regular security updates and patch management should be enforced to prevent similar vulnerabilities from being introduced in future releases, while also ensuring that users are promptly notified of security issues and provided with clear upgrade paths to secure versions of the software.