CVE-2025-6509

Vulnerability

Analysis

The vulnerability resides in the echo function of /src/main/java/controller/SimpleController.java within the seaswalker spring-analysis repository (up to commit 4379cce). The application takes user-supplied input via the name parameter and directly embeds it into the HTML output without proper sanitization or escaping, leading to a reflected Cross-Site Scripting (XSS) flaw [1].

Exploitation

Mechanism

An attacker can exploit this issue by crafting a GET request to /echo?name= and convincing a victim to open the link. The malicious script is reflected in the response and executed by the victim's browser, as the JSP template directly outputs the model attribute ${echo} without encoding [2]. No authentication is required, and the attack can be performed remotely.

Impact

Successful exploitation allows an attacker to inject arbitrary JavaScript into the web page, potentially leading to session hijacking, defacement, or redirection to malicious sites. However, the attack requires user interaction (clicking a crafted link) and is limited to the context of the victim's browser session.

Mitigation

The project uses rolling releases, so no specific patched version is available. The recommended remediation is to properly encode user-controlled data before rendering it in HTML, for example by using Spring's htmlEscape or a template engine that automatically escapes output.