An issue was discovered in Mattermost Server before 3.5.1. XSS can occur via file preview.
{
"github_reviewed": true,
"nvd_published_at": "2020-06-19T20:15:00Z",
"cwe_ids": [
"CWE-79"
],
"github_reviewed_at": "2025-10-21T22:25:35Z",
"severity": "MODERATE"
}