An issue was discovered in Mattermost Server before 2.2.0. It allows XSS because it configures files to be opened in a browser window.
{
"github_reviewed": true,
"nvd_published_at": "2020-06-19T20:15:00Z",
"cwe_ids": [
"CWE-79"
],
"github_reviewed_at": "2025-10-22T21:58:04Z",
"severity": "MODERATE"
}