CVE-2026-86451
Received Received - Intake

Authenticated Information Disclosure in MISP via Object Reference UUID

Publication date: 2026-09-07

Last updated on: 2026-09-07

Assigner: CIRCL

Description
Affected versions of MISP allow authenticated users to retrieve object-reference records by UUID through EventGraphTool::get_reference_data() without first checking whether the requester is authorized to view the object the reference belongs to. The vulnerable code queried ObjectReference.uuid directly and returned the matching row whenever it existed. Because no parent-object ACL was applied, a user who knew or obtained a reference UUID could retrieve information associated with an object outside their normal access scope. The commit explicitly states that any object reference could be returned by UUID without authorizing its parent object. The fix retrieves the referenced object's object_id and calls fetchObjectSimple() with the current user. If the user cannot access that parent object, MISP now returns NotFoundException instead of exposing the reference. Version affected: ≤2.5.45

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Meta Information

Published
2026-09-07
Last Modified
2026-09-07
Generated
2026-09-07
AI Q&A
2026-09-07
EPSS Evaluated
N/A
NVD
CVE-2026-86451
EUVD
EUVD-2026-72396

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
misp misp to 2.5.45 (inc)
misp misp to 2.5.45 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

This vulnerability in MISP (≤2.5.45) allows authenticated users to retrieve object-reference records by UUID without proper authorization checks. The vulnerable code directly queried ObjectReference.uuid and returned matching rows without verifying if the user could access the parent object. This could expose restricted information if a user knew or obtained a reference UUID.

Detection Guidance

To detect this vulnerability, check if your MISP instance is running a version ≤2.5.45. Use the command: misp --version or check the web interface version info. Verify if EventGraphTool::get_reference_data() allows unauthorized access to object references by UUID.

Impact Analysis

An attacker with authenticated access could exploit this to view object references and associated data they are not authorized to see. This may lead to unauthorized information disclosure, potentially exposing sensitive data like malware indicators or threat intelligence shared within MISP.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized access to sensitive data. For GDPR, it may lead to unlawful data processing or breaches of confidentiality. For HIPAA, it could expose protected health information without authorization.

Mitigation Strategies

Immediately upgrade MISP to a version beyond 2.5.45. If upgrading is not possible, apply the patch from the commit c0cb5c9f8 which enforces authorization checks for parent objects before returning references.

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