Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2 fails to sanitize path traversal sequences in template file destination paths, which allows a system admin to perform path traversal attacks via malicious path components, potentially enabling malicious file placement outside intended directories.
{ "github_reviewed_at": "2025-08-21T16:03:12Z", "severity": "MODERATE", "cwe_ids": [ "CWE-22" ], "nvd_published_at": "2025-08-21T08:15:30Z", "github_reviewed": true }