CVE-2026-86342 MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Information
Attackers can view restricted event correlations and feed metadata by bypassing access controls in the freetext feed preview feature.
- 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-2026-86342?
CVE-2026-86342 is a medium-severity missing authorization vulnerability in Misp-Project Misp, published on 7 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Affected versions of MISP contain improper authorization checks in the freetext feed preview functionality. The preview performed correlation lookups against attributes from events without applying the requesting user's ACL, allowing restricted event correlations and associated event information to be exposed to users who could not otherwise access those events. The vulnerable queries were scoped only by attribute values and deletion status rather than MISP's event, organization, sharing-group, attribute, and object-level access controls.
The same preview functionality also returned cross-feed correlation information without properly restricting the feed list to feeds visible to the caller. This exposed metadata for feeds that were not marked lookup_visible; one affected response additionally included the configured feed URL even though that value was not required by the feature.
The fixes apply the caller's ACL to attribute correlation searches, remove feed URLs from correlation results, restrict cross-feed results according to feed visibility, and correct host-organization ID comparison so the authorization rules are applied consistently.
Version affected: ≤2.5.45
Weakness: CWE-862
Which versions are affected by CVE-2026-86342?
It affects 1 product.
Products include Misp-Project Misp.
How do I fix CVE-2026-86342?
No fix has been published for CVE-2026-86342 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-2026-86342 being exploited?
There is no known exploitation of CVE-2026-86342 in the wild and no public exploit code.
Other vulnerabilities in Misp-Project Misp
Sources
Also known as GHSA-hx7m-vxj3-9qmx.