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

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Advisories

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Fixes

Solution

Update Mattermost Plugins to versions 1.1.5 or higher.


Workaround

No workaround given by the vendor.

References
History

Mon, 06 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 06 Apr 2026 13:00:00 +0000

Type Values Removed Values Added
Description 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
Title Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-04-06T13:52:32.798Z

Reserved: 2026-03-04T16:15:21.152Z

Link: CVE-2026-3524

cve-icon Vulnrichment

Updated: 2026-04-06T13:52:23.480Z

cve-icon NVD

Status : Received

Published: 2026-04-06T13:17:18.417

Modified: 2026-04-06T13:17:18.417

Link: CVE-2026-3524

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses