CVE-2026-56423 Missing authorization in misp
Authenticated users can delete event reports and sharing groups belonging to other organizations due to missing per-object authorization checks in bulk deletion endpoints.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56423?
CVE-2026-56423 is a critical missing authorization vulnerability in Misp-Project Misp, published on 22 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports and Sharing Groups. The affected deleteSelection handlers authorized deletion using broad role-level permissions instead of validating authorization for each selected object.
For Event Reports, EventReportsController::deleteSelection relied on the global perm_add capability rather than a per-report ownership/authorization check. As a result, a contributor-level user could submit report IDs or UUIDs for reports belonging to other organisations and hard-delete them instance-wide. The fix changed the callback to call EventReport::fetchIfAuthorized($user, $itemId, 'delete') for each selected report before deletion.
For Sharing Groups, SharingGroupsController::deleteSelection relied on the global perm_sharing_group capability rather than verifying ownership of each selected sharing group. This allowed a sharing-group-capable user to hard-delete sharing groups owned by other organisations, bypassing the per-object ownership gate used by the single-object delete action. The fix changed the callback to call SharingGroup::checkIfOwner($user, $itemId) for each selected sharing group.
An authenticated attacker with the relevant broad role permission could abuse the affected bulk deletion endpoints to delete objects outside their organisation’s authorization scope, causing loss of event-report content or sharing-group configuration across the instance.
Weakness: CWE-862
Which versions are affected by CVE-2026-56423?
It affects 1 product.
Products include Misp-Project Misp.
How do I fix CVE-2026-56423?
No fix has been published for CVE-2026-56423 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-56423 being exploited?
There is no known exploitation of CVE-2026-56423 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Misp-Project Misp
Sources
Also known as GHSA-3vhv-jx5j-gj6p.