CVE-2026-86408

Affected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through CryptographicKeysController::view().


The vulnerable handler queried CryptographicKey directly using the supplied key ID and selected sensitive fields such as:



  *  
type


  *  
key_data


  *  
fingerprint





but did not fetch or authorize the associated parent event first.


The upstream commit explicitly states that cryptographicKeys/view could return a protected event’s signing key to any authenticated user.


The fix adds parent_id and parent_type to the lookup and then enforces authorization through the associated event using fetchSimpleEvent($user, parent_id). If the parent is not an Event, access is limited to site administrators.

Version affected: ≤2.5.45