CVE-2026-95683

MISP Overmind Event View Discloses Report Content Bypassing Report-Level ACL

Published Sep 22, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
In MISP, the Overmind event view enriches an event with its most recent attached report for preview purposes. The enrichment logic fetched the report using only the event ID as the lookup condition, without applying the report's own distribution/ACL constraints. Because MISP reports carry an independent distribution setting that can be more restrictive than the parent event's distribution, an authenticated user who had read access to the event could retrieve and view a report whose distribution explicitly excluded that user. Additionally, the query did not filter out soft-deleted reports, allowing retrieval of reports that had been administratively removed.

The result is an unauthorized disclosure of threat-intelligence report content to users who should not have access under the report's own access-control policy.

The vulnerability requires an authenticated MISP user with at least read access to the affected event.

Remediation

Vendor Solution

The report fetch in the Overmind event enrichment now applies the caller's ACL via EventReport::buildACLConditions($user), enforcing the report's own distribution policy in addition to the event-level access. A condition on EventReport.deleted = 0 is also added to exclude soft-deleted reports. The query is further hardened with recursive = -1 and an explicit contain clause to limit the data retrieved.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Misp
Misp misp
Vendors & Products Misp
Misp misp
Type Values Removed Values Added
Description In MISP, the Overmind event view enriches an event with its most recent attached report for preview purposes. The enrichment logic fetched the report using only the event ID as the lookup condition, without applying the report's own distribution/ACL constraints. Because MISP reports carry an independent distribution setting that can be more restrictive than the parent event's distribution, an authenticated user who had read access to the event could retrieve and view a report whose distribution explicitly excluded that user. Additionally, the query did not filter out soft-deleted reports, allowing retrieval of reports that had been administratively removed. The result is an unauthorized disclosure of threat-intelligence report content to users who should not have access under the report's own access-control policy. The vulnerability requires an authenticated MISP user with at least read access to the affected event.
Title MISP Overmind Event View Discloses Report Content Bypassing Report-Level ACL
Weaknesses CWE-639
CWE-862
References
Metrics cvssV4_0

{'score': 5.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CIRCL
Published
Updated
Sep 22, 2026, 3:28 PM
Reserved
Sep 22, 2026, 2:06 PM
Status
Deferred
Published
Sep 22, 2026, 3:17 PM
Modified
Sep 22, 2026, 4:18 PM