CVE-2026-86408
MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected Events
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 7, 2026
- Updated
- Sep 8, 2026
- Reserved
- Sep 7, 2026
Description
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | CIRCL |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
MISPMISP |
|
References
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