CVE-2023-4725 in Simple Posts Ticker Plugin
Summary
by MITRE • 10/25/2023
The Simple Posts Ticker WordPress plugin before 1.1.6 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)
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Analysis
by VulDB Data Team • 04/23/2025
The Simple Posts Ticker WordPress plugin vulnerability CVE-2023-4725 represents a critical stored cross-site scripting flaw that affects versions prior to 1.1.6. This vulnerability resides in the plugin's handling of user settings and configuration data, where insufficient sanitization and escaping mechanisms leave the system exposed to malicious input. The flaw is particularly concerning because it targets high-privilege users such as administrators who typically possess elevated capabilities within WordPress environments. Even in security-hardened configurations where the unfiltered_html capability is restricted - a common practice in multisite setups and enterprise environments - this vulnerability allows attackers to execute malicious scripts through the plugin's settings interface. The vulnerability stems from the plugin's failure to properly validate and sanitize user-supplied input before storing it in the database and subsequently rendering it in the user interface.
The technical implementation of this vulnerability follows CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-Site Scripting') which is a fundamental web application security weakness. Attackers can exploit this by crafting malicious script code within the plugin's configuration settings, which then gets stored and executed whenever the affected admin user accesses the plugin interface or when the ticker content is rendered on frontend pages. The vulnerability's persistence in stored form means that once exploited, the malicious payload remains active until manually removed or the plugin is updated. This characteristic transforms what might initially appear as a configuration issue into a potentially long-term security risk that can affect multiple users who encounter the malicious content.
The operational impact of this vulnerability extends beyond simple XSS execution as it can enable attackers to escalate privileges, steal session cookies, perform unauthorized administrative actions, or redirect users to malicious websites. In multisite WordPress environments, where security policies often restrict unfiltered_html capabilities, this vulnerability becomes even more dangerous as it bypasses these protective measures. The attack vector typically involves an authenticated administrator accessing the plugin settings page, where they are presented with a form that accepts user input without proper sanitization. When the malicious input is saved and later rendered, it executes in the context of other users' browsers, potentially compromising entire networked environments. This vulnerability aligns with ATT&CK technique T1059.001 - Command and Scripting Interpreter: PowerShell, as it enables the execution of malicious scripts through legitimate administrative interfaces.
Mitigation strategies for CVE-2023-4725 primarily focus on immediate remediation through plugin updates to version 1.1.6 or later, which contain proper input sanitization and escaping mechanisms. Administrators should also implement additional security measures such as restricting administrative access to trusted users only, enabling two-factor authentication, and conducting regular security audits of installed plugins. The principle of least privilege should be enforced by ensuring that only necessary users have administrative capabilities within WordPress installations. Organizations should also consider implementing web application firewalls and content security policies to provide additional layers of protection. Regular monitoring of plugin updates and vulnerability assessments should become standard practice, as this vulnerability demonstrates how seemingly minor input handling flaws can create significant security risks in widely used WordPress plugins. The vulnerability highlights the importance of proper input validation and output escaping in all web applications, particularly those handling user-supplied content in administrative contexts.