CVE-2026-112178 MISP CVE debrief

Who should care

MISP administrators and users with sharing group configurations should assess exposure and prioritize remediation to prevent unauthorized disclosure of proposed attribute changes. This includes reviewing and updating MISP instance access controls to ensure proper distribution level restrictions and verifying MISP instance version and sharing group configurations to identify potential exposure.

Why it matters

Defenders should prioritize verifying and remediating this vulnerability in MISP instances, especially those with sharing group configurations, to prevent unauthorized disclosure of proposed attribute changes. This vulnerability allows users to view proposals on attributes or objects with sharing groups, regardless of distribution level restrictions. MISP administrators and users with sharing group configurations should assess exposure and prioritize remediation.

• Potential unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions
• Need to verify and remediate MISP instances to prevent exploitation
• Possible impact on MISP instance security and data confidentiality

Technical summary

MISP contains an access control flaw in proposal visibility logic, allowing users to view proposals on attributes or objects with sharing groups, regardless of distribution level restrictions (levels 1-3). The owning organization cannot view proposals on its own org-only attributes. This flaw is caused by the authorization check accepting any attribute or object carrying one of the user's sharing groups without verifying the distribution level. Security impact: Unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability in MISP instances, especially those with sharing group configurations, to prevent unauthorized disclosure of proposed attribute changes.

Recommended defensive actions

• Verify MISP instance version and sharing group configurations to identify potential exposure
• Apply security patch (version 2.5.48 or later) to fix the access control flaw
• Review and update MISP instance access controls to ensure proper distribution level restrictions
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the access control flaw in MISP proposal visibility logic, allowing unauthorized users to view proposals on attributes or objects with sharing groups, regardless of distribution level restrictions.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.