CVE-2026-86408: Misp-Project Misp

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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

Affected products

• Misp-Project Misp: up to and including 2.5.45

Published 2026-09-07. Last modified 2026-09-09.