Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate user’s permissions before other validations which allows non-content reviewers to infer a post’s flagged status via direct API call.. Mattermost Advisory ID: MMSA-2026-00754
References
History

Sat, 17 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Fri, 16 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Fri, 16 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
Description Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate user’s permissions before other validations which allows non-content reviewers to infer a post’s flagged status via direct API call.. Mattermost Advisory ID: MMSA-2026-00754
Title Improper order of authorisations in Mattermost GetFile API leads to an authenticated user to determine a post’s quarantined status
Weaknesses CWE-203
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published: 2026-10-16T07:10:12.870Z

Updated: 2026-10-16T14:17:24.943Z

Reserved: 2026-08-01T16:25:43.758Z

Link: CVE-2026-18560

cve-icon Vulnrichment

Updated: 2026-10-16T14:17:14.330Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-16T08:17:12.967

Modified: 2026-10-16T19:23:18.623

Link: CVE-2026-18560

cve-icon Redhat

No data.