CVE-2026-85226 MISP OnDemand Correlation Engine Missing Access Control Allows Disclosure of Restricted Correlations

Medium 5.3 Published 3 Sep 2026 Updated 3 Sep 2026

Authenticated users can view restricted correlation data due to missing access control checks in the OnDemand correlation engine.

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-2026-85226?

CVE-2026-85226 is a medium-severity missing authorization vulnerability in Misp-Project Misp, published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

MISP contains an authorization flaw in the OnDemand correlation engine where correlations were calculated solely from matching attribute values without applying the distribution, sharing group, organization, or other access-control restrictions associated with the correlated attributes and events. As a result, an authenticated user could receive correlation results referring to attributes or events that the user was not authorized to access.

The vulnerable correlation collection path did not take the requesting user into account. The patch changes the correlation collector to accept the current user and filters the resulting attribute identifiers through MISP's existing fetchAttributesSimple() authorization logic, which evaluates event-, attribute-, object-, distribution-, and sharing-group-level restrictions against the live data.

The issue also affected paths relying on previously stored correlation data. Because the OnDemand engine does not maintain the stored correlation table, its denormalized access-control information could be stale. The patch therefore validates correlated attribute identifiers against the current ACLs before returning them and additionally applies normal event visibility conditions when retrieving related events.

An authenticated low-privileged user could exploit this issue by querying or creating attributes that correlate with restricted MISP content, potentially learning information about otherwise inaccessible events or attributes.

Weakness: CWE-862

Which versions are affected by CVE-2026-85226?

It affects 1 product.

Products include Misp-Project Misp.

How do I fix CVE-2026-85226?

No fix has been published for CVE-2026-85226 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-2026-85226 being exploited?

There is no known exploitation of CVE-2026-85226 in the wild and no public exploit code.

All Misp-Project Misp vulnerabilities

Sources

Also known as GHSA-x79g-96j5-8jrv.