CVE-2023-34021 in Church Admin Plugin
Summary
by MITRE • 06/23/2023
Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Andy Moyle Church Admin plugin <= 3.7.29 versions.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 06/23/2023
This vulnerability represents an unauthenticated reflected cross-site scripting flaw within the Church Admin plugin for WordPress, specifically affecting versions up to and including 3.7.29. The issue stems from insufficient input validation and output sanitization mechanisms that fail to properly escape user-supplied data before rendering it in web responses. When malicious actors craft specially formatted requests containing script payloads, these inputs are reflected back to users without adequate sanitization, creating opportunities for arbitrary code execution within victim browsers.
The technical exploitation occurs when the plugin processes parameters from HTTP request strings and directly incorporates them into HTML output without proper encoding or validation. This creates a classic reflected XSS vector where attackers can craft URLs containing malicious JavaScript payloads that execute in the context of authenticated users who view the affected pages. The vulnerability is particularly dangerous because it requires no authentication to exploit, making it accessible to any user with knowledge of the plugin's behavior and available attack vectors.
From an operational impact perspective, this vulnerability compromises the security of entire WordPress installations running vulnerable versions of the Church Admin plugin. Attackers can leverage this weakness to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious sites, or harvest sensitive information from authenticated sessions. The reflected nature of the attack means that exploitation typically requires social engineering to get users to click malicious links, but once executed, the consequences can be severe for church organizations managing sensitive member data and administrative functions.
The vulnerability aligns with CWE-79 which defines Cross-Site Scripting as a common web application security flaw occurring when applications include untrusted data in web pages without proper validation or escaping. This weakness falls under the broader category of injection flaws that represent one of the most prevalent threats in web application security. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, where adversaries leverage web application vulnerabilities to execute malicious code on targeted systems through browser-based attacks.
Organizations should immediately update to the latest version of the Church Admin plugin where this vulnerability has been addressed through proper input validation and output sanitization measures. Additionally, implementing Content Security Policy headers can provide defense-in-depth protection against reflected XSS attacks by restricting script execution sources. Regular security audits and monitoring of plugin repositories for updates remain critical practices for maintaining WordPress site security. Network segmentation and user access controls should also be reviewed to minimize potential impact if exploitation occurs despite preventive measures.