CVE-2026-27656 Mattermost账户接管漏洞

# POC Concept for CVE-2026-27656 # This script simulates the logic flaw in the IsSameUser() function. # The vulnerability allows account takeover via substring matching. def vulnerable_is_same_user(attacker_identity, target_identity): """ Simulates the flawed logic where substring matching is used. If the attacker's identity is a substring of the target's, it returns True. """ return attacker_identity in target_identity def exploit_scenario(): # Scenario: Attacker wants to take over the 'admin' account. target_user = "[email protected]" # Attacker creates an account with a substring identity (e.g., 'admin') attacker_controlled_identity = "admin" print(f"[+] Target Identity: {target_user}") print(f"[+] Attacker Identity: {attacker_controlled_identity}") # Check if the vulnerable logic passes if vulnerable_is_same_user(attacker_controlled_identity, target_user): print("[!] Vulnerability Confirmed: Substring match successful.") print("[!] Result: Attacker can take over the target account.") return True else: print("[-] Match failed.") return False if __name__ == "__main__": exploit_scenario()