Executive Summary

CVE-2025-15094 is a reflected Cross-Site Scripting (XSS) vulnerability in the FlyCMS application, specifically in the userLogin function of the UserController.java file. The vulnerability occurs because the redirectUrl parameter is not properly sanitized or encoded before being included in the login page. This allows an attacker to craft a malicious URL containing JavaScript code in the redirectUrl parameter, which is then executed in the victim's browser when they visit the URL. This can lead to arbitrary script execution in the context of the user's session. [1, 2, 3]

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Impact Analysis

This vulnerability can allow attackers to execute arbitrary JavaScript code in the browsers of users who visit a specially crafted URL. Potential impacts include session hijacking, theft of user credentials, defacement of the website, or other malicious actions performed on behalf of the user. Since the attack can be launched remotely without authentication, it poses a significant risk to users interacting with the affected FlyCMS login page. [1, 2, 3]

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Detection Guidance

This vulnerability can be detected by sending a crafted HTTP GET request to the /login endpoint with a malicious redirectUrl parameter containing a script payload, then observing if the payload is reflected unencoded in the response. For example, using curl or Python requests to send a request like: curl 'http://<target>/login?redirectUrl="><script>alert(1)</script>' and checking if the script tag appears in the response body unescaped. A proof-of-concept in Python using the requests library is available that demonstrates this detection method. [1]

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Mitigation Strategies

Immediate mitigation steps include avoiding use of the vulnerable FlyCMS version or disabling the affected /login endpoint if possible. Since no official patch or fix is available, consider implementing input validation and output encoding for the redirectUrl parameter to prevent script injection. Additionally, monitor and restrict access to the vulnerable endpoint and educate users about the risk of clicking suspicious links. Considering alternative products or applying web application firewall (WAF) rules to block malicious payloads targeting the redirectUrl parameter can also help reduce risk. [2]

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Compliance Impact

The provided resources do not contain information regarding the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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