Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.
{ "nvd_published_at": "2025-04-16T08:15:14Z", "cwe_ids": [ "CWE-863" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2025-04-16T14:53:24Z" }