CVE-2025-1489 in WP-Appbox Plugin
Summary
by MITRE • 02/21/2025
The WP-Appbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's appbox shortcode in all versions up to, and including, 4.5.4 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 02/21/2025
The vulnerability identified as CVE-2025-1489 affects the WP-Appbox plugin for WordPress, representing a critical stored cross-site scripting flaw that has significant implications for website security. This vulnerability exists in all versions up to and including 4.5.4 of the plugin, making it a widespread concern for WordPress users who have not updated to newer versions. The flaw specifically manifests through the plugin's appbox shortcode functionality, which is designed to embed application boxes or widgets within WordPress content. The vulnerability arises from insufficient input sanitization and output escaping mechanisms that fail to properly validate or escape user-supplied attributes before they are processed and rendered in web pages.
The technical nature of this vulnerability allows authenticated attackers who possess contributor-level access or higher to exploit the weakness by injecting malicious scripts through the appbox shortcode attributes. This stored XSS vulnerability means that the malicious code is permanently stored on the server and executed whenever any user accesses a page containing the injected content, regardless of whether the user has administrative privileges or not. The vulnerability specifically targets the plugin's handling of user input through shortcode parameters, where attacker-controlled data flows directly into the HTML output without proper sanitization. This type of vulnerability falls under CWE-79 which categorizes cross-site scripting flaws as a result of insufficient input validation and output escaping.
The operational impact of this vulnerability is severe as it provides attackers with a persistent means of executing malicious code on victim websites. Contributors and higher-level users typically have the ability to create and edit posts, pages, and other content, making this attack vector particularly dangerous in environments where multiple users have elevated privileges. The stored nature of the XSS means that once an attacker successfully injects malicious code, the script will execute automatically for any user who views the affected content, including administrators who might be unaware of the compromise. This creates a persistent backdoor that can be used for various malicious activities including cookie theft, session hijacking, data exfiltration, and redirection to malicious websites. The vulnerability directly aligns with ATT&CK technique T1566 which covers social engineering through malicious content injection, and T1059 which involves execution through scripting.
Mitigation strategies for this vulnerability should focus on immediate remediation through plugin updates to versions that address the sanitization and escaping issues. WordPress administrators should prioritize updating the WP-Appbox plugin to the latest version that contains the patched code. In addition to updating, administrators should implement additional security measures such as restricting contributor-level access to only essential functionality, implementing proper input validation at multiple layers, and conducting regular security audits of plugin installations. The vulnerability demonstrates the importance of proper output escaping and input validation practices, which are fundamental security controls that should be implemented in all web applications. Organizations should also consider implementing web application firewalls and content security policies to provide additional protection layers against similar attacks. Regular security monitoring and vulnerability scanning should be conducted to identify and remediate similar issues in other plugins and themes that may be vulnerable to similar input validation flaws.