CVE-2025-3527 in EventON Pro Plugin
Summary
by MITRE • 05/17/2025
The EventON Pro plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check in the 'assets/lib/settings/settings.js' file in all versions up to, and including, 4.9.6. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability was partially patched in version 4.9.6.
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Analysis
by VulDB Data Team • 05/17/2025
The CVE-2025-3527 vulnerability resides within the EventON Pro plugin for WordPress, representing a critical authorization flaw that undermines the integrity of user-access controls. This vulnerability manifests in the 'assets/lib/settings/settings.js' file where a fundamental capability check is absent, creating a pathway for malicious actors to exploit the system's permission model. The flaw affects all versions up to and including 4.9.6, indicating a prolonged period during which the vulnerability remained unaddressed. The impact is particularly concerning given that the vulnerability requires only Subscriber-level access or higher to exploit, meaning that attackers with minimal privileges can leverage this weakness to compromise the entire system.
The technical implementation of this vulnerability stems from insufficient input validation and authorization checks within the plugin's JavaScript component. When authenticated users with Subscriber privileges or higher access the affected system, they can manipulate the settings.js file to inject malicious web scripts. These scripts are then executed whenever any user accesses pages containing the injected content, creating a persistent cross-site scripting attack vector. This type of vulnerability falls under CWE-863, which specifically addresses "Incorrect Authorization" where the system fails to properly verify that an actor has sufficient privileges to perform a requested action. The vulnerability's persistence is particularly dangerous as it allows attackers to establish a foothold that can be leveraged for further exploitation.
The operational impact of CVE-2025-3527 extends far beyond simple data modification, as it enables attackers to execute arbitrary code within the context of the victim's browser. This creates a significant risk for organizations where subscribers or lower-level users might have access to systems that are not properly segmented from more sensitive areas. The vulnerability aligns with ATT&CK technique T1566.001, which covers "Phishing: Spearphishing Attachment" and T1059.001 for "Command and Scripting Interpreter: PowerShell", as attackers can use the injected scripts to perform various malicious activities. The fact that this vulnerability was partially patched in version 4.9.6 suggests that the developers recognized the severity but may not have implemented a complete solution, leaving potential gaps in protection that attackers could exploit.
Security professionals should prioritize immediate remediation of this vulnerability by upgrading to a patched version of the EventON Pro plugin, while also implementing network-based monitoring to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of proper capability checks and input validation in web applications, particularly in content management systems where multiple user roles exist. Organizations should also conduct thorough security audits of their WordPress installations to identify other potential vulnerabilities in similar plugins or themes that may exhibit similar authorization flaws. The partial patching in version 4.9.6 indicates that the vulnerability may have required more comprehensive architectural changes than initially implemented, highlighting the need for robust security testing and validation before releasing updates to production environments.