CVE-2026-86342: MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Information
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 lookupvisible; 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
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
A user who can use the freetext feed preview functionality may obtain correlation and associated event information for events they are not authorized to access. The issue also exposes cross-feed metadata for feeds not visible to that user.
What information may be exposed?
The preview can reveal restricted event correlations and associated event information. It can also disclose metadata for feeds not marked lookup_visible; at least one affected response included a configured feed URL.
Are default access restrictions sufficient to prevent exposure?
No. The vulnerable preview queries did not apply MISP event, organization, sharing-group, attribute, or object-level ACLs, and cross-feed results were not consistently limited by feed visibility.
Which deployments are affected?
MISP versions 2.5.45 and earlier are affected.
What should be done if patching cannot happen immediately?
Restrict access to the freetext feed preview functionality to trusted users, since users able to invoke it may retrieve information beyond their normal event and feed permissions.