---
id: CVE-2026-91825
title: >-
  Affected versions of MISP fail to authorize a submitted sharing group in a
  specific event-edit path.



  The vulnerable logic checked whether the acting user could use a
  sharing_group_id only when the request explicitly supplied distributi…
summary: >-
  Affected versions of MISP fail to authorize a submitted sharing group in a
  specific event-edit path.



  The vulnerable logic checked whether the acting user could use a
  sharing_group_id only when the request explicitly supplied distributi…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-862
vendor: MISP
product: MISP
affected:
  - MISP < 2.5.46
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:48.460'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91825'
references:
  - url: 'https://github.com/MISP/MISP/commit/cf3ee4026'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
epss: 0.00389
epssPercentile: 0.30287
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T13:59:42.790533Z'
cvssSource: cna
ingestedAt: '2026-09-15T08:34:10.549Z'
---

## Overview

Affected versions of MISP fail to authorize a submitted sharing group in a specific event-edit path.


The vulnerable logic checked whether the acting user could use a sharing_group_id only when the request explicitly supplied distribution = 4. If the attacker instead omitted distribution but supplied a different sharing_group_id, that authorization branch was skipped. Later, MISP’s field-recovery logic restored the existing event distribution from storage. For events already configured with sharing-group distribution, the unauthorized sharing-group ID could therefore be saved.


The fix adds authorization checks in both the controller and Event::_edit() whenever a non-empty sharing_group_id is supplied without distribution. The model now calls SharingGroup::checkIfAuthorised() before persisting the change.



Version affected: ≤2.5.45

## Remediation

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