---
id: CVE-2026-3524
title: >-
  Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing
  after a failed authorization check in ServeHTTP which allows an authenticated
  attacker to access, create, download, and delete legal hold data via crafted
  API …
summary: >-
  Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing
  after a failed authorization check in ServeHTTP which allows an authenticated
  attacker to access, create, download, and delete legal hold data via crafted
  API …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
vendor: mattermost
product: legal_hold
affected:
  - legal_hold < 1.1.5
patched:
  - legal_hold 1.1.5
published: '2026-04-06'
updated: '2026-08-06'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3524'
references:
  - url: 'https://mattermost.com/security-updates'
    label: responsibledisclosure@mattermost.com
tags:
  - nvd
epss: 0.00378
epssPercentile: 0.31726
ingestedAt: '2026-08-06T14:59:48.612Z'
---

## Overview

Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621

## Affected

- `legal_hold < 1.1.5`

## Remediation

Upgrade past the affected range:

- `legal_hold 1.1.5`