Medium 5.3Published Sep 7, 2026

CVE-2026-86342MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Information

Updated under an hour ago (2026-10-19 06:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for MISP

Exploited in the last 30 days

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

CVSS: 5.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: CIRCL
NVD analysis: Analyzed
Record last updated: Sep 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

MISP MISP misp:misp (from the name)	through 2.5.45	CNA record
misp-project misp misp-project:misp	through 2.5.45	NVD

References

https://github.com/MISP/MISP/commit/dedb4b297patch
https://github.com/MISP/MISP/commit/4b6916086patch
https://github.com/MISP/MISP/commit/dc1a0f7c2patch
https://github.com/MISP/MISP/commit/1fb622046patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.