CVE-2026-104910 MISP CVE debrief

Who should care

Defenders responsible for MISP instances, threat intelligence teams, and security administrators should assess exposure and prioritize mitigation. They should focus on restricting access to sensitive event metadata and monitoring for potential reconnaissance attempts. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

This authorization bypass in MISP's related events listing functionality allows authenticated users to access metadata of events they are not permitted to view, potentially leading to reconnaissance and unauthorized disclosure of sensitive information. Defenders should prioritize verifying and mitigating this vulnerability in MISP instances, focusing on restricting access to sensitive event metadata.

• Potential reconnaissance of threat-intelligence event names and timelines across sharing groups
• Unauthorized disclosure of event metadata

Technical summary

MISP contains an authorization bypass in the related events listing functionality, allowing users to access metadata of events they are not permitted to view. The vulnerability exists in MISP versions prior to the fix commit (2ffa97f05). An authenticated user with access to at least one event in MISP can exploit this vulnerability if correlation entries link that event to other events the user should not be able to view. This can lead to unauthorized disclosure of event metadata, including titles, dates, and correlation counts.

Defensive priority

Defenders should prioritize verifying and mitigating this vulnerability in MISP instances, focusing on restricting access to sensitive event metadata.

Recommended defensive actions

• Verify MISP instance vulnerability and apply patches or mitigations
• Restrict access to sensitive event metadata
• Monitor for potential reconnaissance attempts
• 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 NVD entry provide details on the authorization bypass in MISP's related events listing functionality, allowing unauthorized disclosure of event metadata. The vulnerability exists in MISP versions prior to the fix commit (2ffa97f05). Defenders should verify MISP instance vulnerability and apply patches or mitigations. The correlation table stores a snapshot of the event's distribution level and sharing group at the time the correlation was created, and does not carry the published flag.

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.