CVE-2023-33329 in Custom Post Type Generator Plugin
Summary
by MITRE • 07/18/2023
Auth. (admin+) Reflected Cross-Site Scripting (XSS) vulnerability in Hijiri Custom Post Type Generator plugin <= 2.4.2 versions.
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Analysis
by VulDB Data Team • 07/18/2023
This reflected cross-site scripting vulnerability exists within the Hijiri Custom Post Type Generator WordPress plugin affecting versions 2.4.2 and earlier. The flaw occurs when administrative users interact with specific plugin endpoints that fail to properly sanitize user input before reflecting it back in HTTP responses. Attackers can craft malicious URLs containing crafted script payloads that, when visited by administrators with elevated privileges, execute within the administrator's browser context. This represents a critical authorization bypass vulnerability as it requires only administrative access levels to exploit, making it particularly dangerous in environments where plugin configurations are frequently managed by privileged users.
The technical implementation of this vulnerability stems from improper input validation and output encoding practices within the plugin's admin interfaces. When administrators navigate to specific plugin pages or perform certain actions through the WordPress admin dashboard, the application fails to implement adequate sanitization measures for parameters received from HTTP requests. This reflected XSS occurs because the plugin directly incorporates user-supplied data into HTML responses without proper context-aware escaping mechanisms. The vulnerability is classified under CWE-79 as a classic reflected cross-site scripting flaw, where malicious scripts are reflected off of web applications back to users.
The operational impact of this vulnerability is severe as it enables attackers to escalate privileges and potentially take full control of compromised WordPress installations. An attacker who successfully exploits this vulnerability can execute arbitrary JavaScript code within the administrator's browser session, potentially leading to session hijacking, credential theft, or unauthorized modification of plugin settings. The reflected nature of the vulnerability means that exploitation requires social engineering to trick administrators into visiting malicious URLs, but once executed, the attack vector allows for persistent access and data exfiltration. This vulnerability directly aligns with ATT&CK technique T1566.002 for Phishing with Social Engineering and T1078.004 for Valid Accounts for legitimate credential access.
Mitigation strategies should focus on immediate plugin updates to versions 2.4.3 or later where the XSS vulnerability has been patched. Administrators should implement strict input validation and output encoding practices across all user-facing interfaces, particularly in administrative areas. Network-based solutions such as web application firewalls can provide additional protection by filtering suspicious payloads before they reach vulnerable endpoints. Regular security audits of WordPress plugins should include verification of proper sanitization routines and input validation mechanisms. Additionally, implementing the principle of least privilege for plugin administration access reduces the attack surface, while regular monitoring of administrator activity logs can help detect potential exploitation attempts. Organizations should also consider deploying Content Security Policy headers to limit script execution capabilities in browser contexts where reflected XSS vulnerabilities may exist.