Introduction

While exploring i-Educar system, I discovered a stored XSS vulnerability in the /module/TabelaArredondamento/edit endpoint. The nome parameter, allows the injection of malicious scripts without any sanitization.

These scripts are stored in the database and executed automatically when the corresponding listing page is accessed.

In this post, I’ll walk you through the technical details, how the vulnerability was exploited (PoC), screenshots with real evidence, and the security risks it represents in real-world environments.

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What is CVE-2025-9720?

The CVE-2025-9720 is a Stored Cross-Site Scripting (XSS) vulnerability found in the /module/TabelaArredondamento/edit endpoint of the i-Educar application.

The nome parameter fails to properly validate user inputs, allowing attackers to persist JavaScript payloads on the server. The malicious code is executed automatically.

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Technical Details

» Vulnerable Endpoint: /module/TabelaArredondamento/edit

» Affected Parameter: nome

» Payload Used:

"><img src=x onerror=alert('CVE-Hunters')>

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Proof of Concept (PoC)

To reproduce the vulnerability:

» Access the endpoint: /module/TabelaArredondamento/edit;

» Insert the payload in the: “Nome” field;

» Click on: “Salvar”

Payload will execute automatically after save:

You can access the full technical report with all step-by-step evidence here:

CVE-2025-9720 Report

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Impact

This Cross-Site Scripting (XSS) vulnerability can be exploited to:

• Steal session cookies (session hijacking);
• Install malware on victims’ devices;
• Steal credentials stored in the browser;
• Redirect users to malicious websites;
• Deface the application interface;
• Damage the institutional reputation.

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Official Sources

This vulnerability was reported responsibly and is publicly registered as:

• CVE-2025-9720 on CVE.org

• VulDB Entry

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Credits

Discovered with💜 by Karina Gante.

LinkedIn ✿ GitHub ✿ Gmail ✿ Instagram

Official Member of CVE-Hunters🏹

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