CVE-2023-23786 in affiliate-toolkit Plugin
Summary
by MITRE • 05/10/2023
Auth. (editor+) Stored Cross-Site Scripting (XSS) vulnerability in Christof Servit affiliate-toolkit plugin <= 3.3.3 versions.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/10/2023
The CVE-2023-23786 vulnerability represents a stored cross-site scripting flaw within the Christof Servit affiliate-toolkit WordPress plugin, affecting versions up to and including 3.3.3. This security weakness resides in the plugin's handling of user input within the editor+ authentication level, creating a persistent threat vector that can be exploited by authenticated attackers with sufficient privileges. The vulnerability specifically targets the plugin's data processing mechanisms where user-supplied content is not properly sanitized before being stored and subsequently rendered in web pages, allowing malicious scripts to be injected and executed in the context of other users' browsers.
The technical implementation of this vulnerability stems from inadequate input validation and output escaping mechanisms within the affiliate-toolkit plugin's administrative interfaces. When editors with editor+ privileges submit content through the plugin's forms or data entry points, the system fails to adequately sanitize the input before storing it in the database. This stored data is then retrieved and displayed without proper HTML escaping, enabling attackers to embed malicious JavaScript code that executes when other users view the affected content. The vulnerability operates under CWE-79 which classifies cross-site scripting as a weakness involving the improper sanitization of user-provided data, and aligns with ATT&CK technique T1566.001 which covers the exploitation of web application vulnerabilities through malicious input injection.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers with editor+ privileges to potentially escalate their access within the WordPress environment. Once exploited, the stored XSS could allow threat actors to steal session cookies, redirect users to malicious domains, deface the website, or even execute more sophisticated attacks such as credential theft or privilege escalation. The vulnerability is particularly concerning because it requires only authentication level access, meaning that an attacker who has obtained credentials for an editor account can leverage this flaw to compromise other users within the same WordPress installation. This creates a significant risk for websites where multiple editors or contributors have access to the affiliate-toolkit plugin functionality.
Mitigation strategies for CVE-2023-23786 should prioritize immediate plugin updates to versions that address the XSS vulnerability, as the vendor has likely released patches to correct the input sanitization issues. Organizations should implement comprehensive input validation measures that filter and escape all user-supplied content before storage, ensuring that any potentially malicious scripts are neutralized through proper HTML entity encoding. Additionally, security teams should consider implementing content security policies that restrict script execution within the affected plugin's administrative areas, and establish monitoring protocols to detect unauthorized modifications to plugin data. Network segmentation and privilege reduction practices can further minimize the attack surface by limiting the scope of potential exploitation, while regular security audits should verify that similar sanitization gaps do not exist in other plugin components or custom code within the WordPress environment. The vulnerability demonstrates the critical importance of proper input validation in web applications and serves as a reminder of how authenticated privilege levels can be exploited to create persistent security threats within content management systems.