CVE-2026-18560 — Improper order of authorisations in Mattermost GetFile API leads to an authenticated user to determine a post’s quarantined status
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-conten…
Published: 2026-10-16 · CVSS: 4.3 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7