CVE-2026-11898 in White Label CMS Plugin
Summary
by MITRE • 07/11/2026
The White Label CMS plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 2.7.12 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
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Analysis
by VulDB Data Team • 07/11/2026
The White Label CMS plugin for WordPress presents a critical stored cross-site scripting vulnerability that compromises the security of affected installations. This vulnerability exists within the plugin's admin settings functionality and affects all versions up to and including 2.7.12, creating a persistent threat vector that can be exploited by authenticated attackers possessing administrator-level permissions or higher. The flaw stems from inadequate input sanitization measures and insufficient output escaping mechanisms within the plugin's codebase, allowing malicious actors to inject arbitrary web scripts into the system's administrative interface.
The technical exploitation of this vulnerability requires an attacker to have administrative access or equivalent privileges, which significantly reduces the attack surface but does not eliminate the risk entirely. The stored nature of the XSS vulnerability means that once malicious code is injected into the admin settings, it persists within the system and executes whenever any user accesses pages containing the injected content. This creates a particularly dangerous scenario where legitimate users who visit affected pages become unwitting participants in the attack execution. The vulnerability specifically targets multi-site WordPress installations and environments where the unfiltered_html capability has been disabled, indicating that certain security configurations may actually make systems more susceptible to this particular exploit.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform a wide range of malicious activities including credential theft, session hijacking, data exfiltration, and privilege escalation within the compromised WordPress environment. The fact that this affects multi-site installations amplifies the potential damage, as a successful attack on one site within the network could potentially compromise multiple sites or affect the entire network infrastructure. Attackers can leverage this vulnerability to establish persistent backdoors, modify critical system settings, or redirect users to malicious domains while maintaining administrative control over the affected WordPress installations.
Organizations should implement immediate mitigations including updating to the latest plugin version where available, applying the necessary input sanitization and output escaping patches, and conducting comprehensive security audits of all administrative interfaces. The vulnerability aligns with CWE-79 (Cross-site Scripting) and can be categorized under ATT&CK technique T1059.001 (Command and Scripting Interpreter: PowerShell) or similar execution techniques when attackers leverage the stored scripts for further exploitation. Administrators should also consider implementing additional security controls such as role-based access restrictions, regular monitoring of administrative settings changes, and network-level protections to detect and prevent unauthorized script injection attempts within their WordPress environments.
This vulnerability demonstrates the critical importance of proper input validation and output escaping in web applications, particularly within content management systems where administrative interfaces handle user-supplied data. The combination of insufficient sanitization with persistent script storage creates a particularly dangerous exploit scenario that requires immediate attention from security teams responsible for maintaining WordPress installations. Organizations should prioritize patch management processes to ensure all plugin components remain up-to-date and protected against known vulnerabilities while maintaining comprehensive logging and monitoring capabilities to detect potential exploitation attempts.