CVE-2026-54398 MISP object edit authorization bypass allows unauthorized sharing group assignment
Authenticated users can bypass sharing group validation to assign objects to unauthorized groups, potentially disclosing group names and modifying distribution metadata.
- 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-2026-54398?
CVE-2026-54398 is a medium-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
An authorization flaw in MISP’s object add/edit handling allowed an authenticated user with object editing permissions to assign a MISP object, or attributes contained within an object, to a sharing group that the user was not authorized to use or view. When editing objects, the sharing group validation was performed against the wrong request data structure after object fields had been merged to the top level, causing the check to be bypassed. In addition, attributes embedded in objects were not individually validated for authorized sharing group use.
An attacker could craft a request with distribution set to 4 and an arbitrary sharing_group_id, potentially disclosing the existence or name of otherwise non-visible sharing groups and improperly modifying the distribution metadata of objects or contained attributes.
Weakness: CWE-863
Which versions are affected by CVE-2026-54398?
How do I fix CVE-2026-54398?
No fix has been published for CVE-2026-54398 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-2026-54398 being exploited?
There is no known exploitation of CVE-2026-54398 in the wild and no public exploit code.
Sources
Also known as GHSA-27wx-pvwm-cfh2.