---
id: CVE-2026-91857
title: "Affected versions of MISP expose several state-changing controller actions without restricting them to POST.\n\n\nThe affected actions are:\n\n\n\n -\_EventReportsController::purgeUnusedPictures()\n\n -\_NoticelistsController::enableNoticelist()\n\n …"
summary: "Affected versions of MISP expose several state-changing controller actions without restricting them to POST.\n\n\nThe affected actions are:\n\n\n\n -\_EventReportsController::purgeUnusedPictures()\n\n -\_NoticelistsController::enableNoticelist()\n\n …"
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'
cwe:
  - CWE-352
vendor: MISP
product: MISP
affected:
  - MISP < 2.5.46
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:48.977'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91857'
references:
  - url: 'https://github.com/MISP/MISP/commit/b4a5486b5'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
epss: 0.00214
epssPercentile: 0.10513
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T13:10:25.729586Z'
cvssSource: cna
ingestedAt: '2026-09-15T09:34:49.387Z'
---

## Overview

Affected versions of MISP expose several state-changing controller actions without restricting them to POST.


The affected actions are:



 - EventReportsController::purgeUnusedPictures()

 - NoticelistsController::enableNoticelist()

 - ServersController::removeOrphanedCorrelations()

 - WorkflowsController::rebuildRedis()






The patch adds allowMethod(['post']) to each action, preventing them from being triggered through ordinary GET requests.


For purgeUnusedPictures(), the corresponding UI previously used $.get(). The fix converts that request to POST and supplies X-CSRF-Token, while the controller enables header-only CSRF validation for that AJAX action.


Because GET requests can be induced cross-origin through links, images, redirects, or navigation, accepting GET for these state-changing operations can let an attacker trigger them using the authenticated victim's session.

Version affected: ≤2.5.45

## Remediation

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