CVE-2026-116469: MISP Guard case-sensitivity bypass in policy enforcement

CVE-2026-116469 · Severity: info · Published 2026-10-26

MISP Guard is a security filter that controls which threat intelligence events are distributed to downstream consumers based on policies like data classification and permitted categories. An attacker with event-creation privileges can bypass these controls by altering the capitalization of taxonomy tags, attribute categories, or sharing-group identifiers, causing restricted data to be forwarded in violation of the organization's distribution policy.

Vendors: Misp.

Quick answers

Is CVE-2026-116469 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-116469 being exploited in the wild.
How severe is CVE-2026-116469?
Informational severity, published 26 October 2026.
Which products and versions are affected?
MISP MISP Guard.
Is there a fix for CVE-2026-116469?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-116469 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-116469?
Check whether you run MISP Guard. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a case-sensitivity flaw in policy enforcement functions (check_required_taxonomy_exists, check_required_taxonomy_tags_allowed, check_blocked_attribute_categories, check_blocked_analyst_data_sharing_groups_uuids) that perform case-sensitive string comparisons against allow/block lists. An attacker with MISP event-creation privileges can craft events with mismatched capitalization (e.g., 'TLP:AMBER' instead of 'tlp:amber') to evade policy checks and pass restricted events downstream. The fix requires case-insensitive comparison logic in all affected policy enforcement checks.

Affected products

  • MISP MISP Guard

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