---
id: CVE-2026-86451
title: >-
  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 bel…
summary: >-
  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 bel…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-639
  - CWE-862
vendor: misp-project
product: misp
affected:
  - misp <= 2.5.45
published: '2026-09-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T15:23:58.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86451'
references:
  - url: 'https://github.com/MISP/MISP/commit/c0cb5c9f8'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
epss: 0.00174
epssPercentile: 0.07215
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T14:52:40.900379Z'
scores:
  nvd: 4.3
  cna: 5.3
ingestedAt: '2026-09-08T15:33:26.977Z'
---

## Overview

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

## Affected

- `misp <= 2.5.45`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.