The WP Activity Log plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘message’ parameter in all versions up to, and including, 5.2.2 due to insufficient input sanitization and output escaping. This vulnerability allows unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. With a CVSS score of 7.2, this high-severity vulnerability poses significant risks to organizations using the affected plugin.
Risk to organizations includes potential unauthorized access to sensitive user data and site manipulation, which can result in reputational damage and user trust degradation. Given the low attack complexity and the fact that no user interaction is required, this vulnerability can be easily exploited. Organizations should prioritize patching immediately.
Currently, there is a public proof of concept (PoC) available in a GitHub repository, indicating that the exploitation of this vulnerability is feasible. Security teams are advised to apply the relevant patches and update to the latest version of the WP Activity Log plugin to mitigate this risk.
Organizations using the WP Activity Log plugin must take immediate action to secure their systems, as the potential for exploitation is high and could lead to severe consequences.
Vulnerability Details
The vulnerability in the WP Activity Log plugin stems from insufficient input validation and output escaping, allowing attackers to exploit the ‘message’ parameter. This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')).
The CVSS 3.1 score of 7.2 indicates a high severity level, suggesting that organizations should address this vulnerability in their priority patch cycle. The attack vector is classified as NETWORK, with low complexity, and no privileges are required for exploitation.
The vulnerability was published on February 17, 2025, and affects all versions of the WP Activity Log plugin prior to 5.3.0. The potential impacts include low confidentiality and integrity damage, with no availability impact.
Technical Analysis
The root cause of the vulnerability is the lack of proper sanitization of user input in the ‘message’ parameter, allowing attackers to insert malicious scripts that execute in the user's browser context. The attack vector is through the network, requiring no special privileges, and it does not necessitate user interaction.
Given the low attack complexity and the nature of the exploit, it is essential for organizations to implement security measures such as input validation and output encoding to prevent such vulnerabilities.
Risk & Impact Analysis
Real-world deployment of this vulnerability can result in significant organizational risks, especially for those relying on the WP Activity Log plugin for monitoring and logging user activity. Attackers may leverage this vulnerability to inject scripts that can redirect users to malicious sites or steal sensitive information.
The blast radius potential is high, as the impact is not limited to a single user but can affect all users accessing the injected page. Organizations should urgently assess their exposure to this vulnerability and consider implementing additional security layers, such as web application firewalls, to mitigate potential exploits.
Given the CVSS score of 7.2, this vulnerability falls into a high urgency category, and organizations should prioritize patching within their immediate response efforts.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of the WP Activity Log plugin for WordPress prior to 5.3.0 are affected by this vulnerability. Organizations should ensure they are using an updated version to prevent exploitation.
Mitigation & Remediation
To mitigate this vulnerability, organizations must apply the latest updates to the WP Activity Log plugin immediately. The patch can be found in the official release notes.
If immediate patching is not possible, it is recommended to implement input validation and output encoding for all user inputs. Additionally, organizations can consider deploying web application firewalls to help prevent exploitation of this and similar vulnerabilities.
For further guidance on testing and validating security measures, organizations can refer to the penetration testing services provided by AppSecure.
Detection Guidance
Organizations should monitor their logs for any anomalous behavior that may indicate attempts to exploit this vulnerability. Look for unusual input patterns in the 'message' parameter and any signs of unauthorized script execution.
Network signatures associated with common web-based attacks can also be useful in detecting attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The emergence of this vulnerability highlights the ongoing challenges in web application security, particularly with plugins that may not undergo rigorous security reviews. Organizations are encouraged to adopt a comprehensive security strategy that includes regular vulnerability assessments and updates to all software components.
Security teams should prioritize understanding the implications of such vulnerabilities and implement defensive measures proactively. For more insights on vulnerability management and security best practices, visit our blog on vulnerability management and the importance of continuous security testing.
To further enhance your security posture, consider our offerings in red teaming and proactive threat hunting.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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