Platform
wordpress
Component
sensorpress-uptime-monitoring
Fixed in
1.0.1
CVE-2025-49409 describes a critical Stored Cross-Site Scripting (XSS) vulnerability discovered in the brewlabs SensorPress WordPress plugin. This vulnerability allows attackers to inject malicious scripts that are stored on the server and executed when other users access affected pages. The vulnerability impacts versions of SensorPress from n/a up to and including version 1.0, with a fix available in version 1.0.1.
Successful exploitation of CVE-2025-49409 allows an attacker to execute arbitrary JavaScript code in the context of a victim's browser. This can lead to a wide range of malicious activities, including session hijacking, credential theft (e.g., stealing login cookies), defacement of the website, and redirection to phishing sites. The stored nature of the XSS means that the malicious script persists on the server, potentially affecting numerous users who visit the compromised pages. The impact is particularly severe for websites with sensitive user data or critical functionality, as an attacker could gain complete control over user accounts and potentially the entire website.
CVE-2025-49409 was publicly disclosed on 2025-08-20. The vulnerability is considered high-risk due to its CRITICAL CVSS score and the ease with which it can be exploited. No public proof-of-concept (POC) code has been released at the time of writing, but the simplicity of XSS vulnerabilities suggests that a POC is likely to emerge quickly. It is not currently listed on the CISA KEV catalog.
Exploit Status
EPSS
0.03% (8% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2025-49409 is to immediately upgrade the SensorPress plugin to version 1.0.1 or later. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider implementing a Web Application Firewall (WAF) rule to filter out potentially malicious input. Specifically, look for patterns associated with XSS payloads, such as <script> tags, event handlers (e.g., onload, onclick), and JavaScript functions. Carefully review and sanitize all user-supplied input before displaying it on the website. After upgrading, verify the fix by attempting to inject a simple XSS payload (e.g., <script>alert('XSS')</script>) into a form field and confirming that the script is not executed.
Update the SensorPress plugin to the latest available version to mitigate the XSS vulnerability. Check for plugin updates directly in the WordPress admin panel or through the WordPress plugin repository. Implement additional security measures, such as user input validation and sanitization, to prevent future XSS vulnerabilities.
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2025-49409 is a critical Stored XSS vulnerability in the brewlabs SensorPress WordPress plugin, allowing attackers to inject malicious scripts.
You are affected if you are using SensorPress versions prior to 1.0.1. Check your plugin version and update immediately.
Upgrade SensorPress to version 1.0.1 or later. Consider a WAF as a temporary mitigation if upgrading is not immediately possible.
While no active exploitation has been confirmed, the vulnerability's severity and ease of exploitation suggest it is likely to be targeted.
Refer to the brewlabs SensorPress website or the WordPress plugin repository for the official advisory and update information.
Upload your dependency file and we'll tell you instantly if this and other CVEs hit you.
Upload your dependency file and we'll tell you instantly if this and other CVEs hit you.