CVE-2025-8369: Portabilis i-Educar XSS Vulnerability

CVE-2025-8369 Overview

CVE-2025-8369 is a reflected cross-site scripting (XSS) vulnerability in Portabilis i-Educar 2.9, an open-source school management platform. The flaw resides in /intranet/educar_avaliacao_desempenho_lst.php, where the titulo_avaliacao parameter is reflected into the response without proper sanitization. Attackers can craft a malicious URL that executes arbitrary JavaScript in the victim's browser when opened. The exploit has been publicly disclosed, and the vendor did not respond to disclosure attempts. The vulnerability is categorized under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in an authenticated user's browser session, potentially leading to session data disclosure, UI defacement, or social engineering against school staff and administrators.

Affected Products

Portabilis i-Educar 2.9.0
Component: /intranet/educar_avaliacao_desempenho_lst.php
Parameter: titulo_avaliacao

Discovery Timeline

2025-07-31 - CVE-2025-8369 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8369

Vulnerability Analysis

The vulnerability is a reflected XSS flaw in the performance evaluation listing page of Portabilis i-Educar. When a request is submitted to /intranet/educar_avaliacao_desempenho_lst.php, the application takes the value of the titulo_avaliacao query parameter and renders it back into the HTML response. Because the application fails to apply contextual output encoding or input filtering, an attacker-supplied payload containing HTML or JavaScript is interpreted by the browser as executable content. The attack requires user interaction, meaning the victim must click a crafted link or visit an attacker-controlled page that triggers the request. Impact is limited to integrity of the rendered page, with no direct impact on confidentiality or availability of the server itself.

Root Cause

The root cause is missing output encoding on the titulo_avaliacao parameter before it is inserted into the HTML response. The PHP script writes user-controlled input directly into the DOM without escaping special characters such as <, >, ", and '. This corresponds to [CWE-79], where dynamic content generation fails to neutralize input during web page generation.

Attack Vector

The attack is remote and network-based. An attacker crafts a URL targeting /intranet/educar_avaliacao_desempenho_lst.php with a JavaScript payload embedded in the titulo_avaliacao parameter. The attacker delivers this URL to an authenticated i-Educar user via phishing, chat, or a malicious referring site. When the victim visits the link, the injected script executes in the browser within the origin of the i-Educar deployment. Refer to the public GitHub CVE-2025-8369 Documentation and the Reflected XSS Analysis for the payload details.

Detection Methods for CVE-2025-8369

Indicators of Compromise

HTTP requests to /intranet/educar_avaliacao_desempenho_lst.php containing HTML tags, script fragments, or URL-encoded angle brackets (%3C, %3E) in the titulo_avaliacao parameter.
Web server access logs showing unusually long titulo_avaliacao values or values including keywords such as onerror, onload, javascript:, or <script.
User reports of unexpected pop-ups, redirects, or page behavior after clicking links to the i-Educar portal.

Detection Strategies

Deploy web application firewall (WAF) signatures that flag XSS payload patterns in query string parameters directed at educar_avaliacao_desempenho_lst.php.
Correlate web proxy logs with endpoint browser telemetry to identify users who clicked crafted URLs referencing the vulnerable endpoint.
Perform regular authenticated dynamic application security testing (DAST) against the i-Educar deployment to surface reflected XSS in the intranet module.

Monitoring Recommendations

Enable verbose HTTP request logging on the i-Educar web server and forward logs to a centralized SIEM for pattern matching.
Alert on outbound requests from staff browsers to unfamiliar domains immediately after visiting /intranet/ URLs, which may indicate exfiltration by injected scripts.
Track sessions of privileged i-Educar accounts for anomalous actions performed shortly after navigating to the affected endpoint.

How to Mitigate CVE-2025-8369

Immediate Actions Required

Restrict network access to the i-Educar intranet interface to trusted internal networks or VPN users only.
Instruct staff and administrators to avoid clicking untrusted links referencing the i-Educar portal until the issue is patched.
Deploy WAF rules that block or sanitize suspicious characters in the titulo_avaliacao parameter of educar_avaliacao_desempenho_lst.php.
Rotate active session cookies and force reauthentication if suspicious requests have been logged.

Patch Information

At the time of publication, no vendor-supplied patch is available. Portabilis was contacted regarding this disclosure but did not respond. Administrators should monitor the Portabilis i-Educar GitHub repository for future security releases and consult the VulDB entry #318341 for updates.

Workarounds

Apply a local source-code fix that HTML-encodes the titulo_avaliacao value using htmlspecialchars($value, ENT_QUOTES, 'UTF-8') before rendering.
Configure a Content Security Policy (CSP) header on the i-Educar web server that disallows inline scripts, reducing the impact of reflected XSS.
Enable the HttpOnly and Secure flags on session cookies to limit the value of stolen tokens via JavaScript.
Place the application behind a reverse proxy that strips or encodes HTML metacharacters in query parameters targeting the affected endpoint.

bash

# Example nginx reverse proxy rule to block XSS payloads on the vulnerable endpoint
location /intranet/educar_avaliacao_desempenho_lst.php {
    if ($arg_titulo_avaliacao ~* "(<|>|script|onerror|onload|javascript:)") {
        return 403;
    }
    proxy_pass http://ieducar_backend;
}