CVE-2026-54360 MISP sharing group creation mass assignment allows unauthorized takeover of existing sharing groups
Authenticated users can hijack existing sharing groups via mass assignment, bypassing access controls to modify or view unauthorized shared data.
- 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-2026-54360?
CVE-2026-54360 is a high-severity missing authorization vulnerability in misp, published on 12 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A mass assignment vulnerability exists in MISP’s sharing group creation endpoint. When creating a new sharing group, the controller did not remove a user-supplied id field before saving the submitted data. In CakePHP, supplying a primary key in the save data can cause a create() followed by save() operation to update an existing record instead of creating a new one.
An authenticated user with permission to add sharing groups could therefore submit the identifier of an existing sharing group and modify that sharing group without passing the normal edit access-control checks. This may allow the attacker to take over or alter sharing groups they do not otherwise have access to, potentially affecting the confidentiality and integrity of information shared through those groups.
Affected component: app/Controller/SharingGroupsController.php, add() action
Weakness: CWE-639
Which versions are affected by CVE-2026-54360?
How do I fix CVE-2026-54360?
No fix has been published for CVE-2026-54360 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-2026-54360 being exploited?
There is no known exploitation of CVE-2026-54360 in the wild and no public exploit code.
Sources
Also known as GHSA-j794-65mg-q3vf.