An issue was discovered in Mattermost Server before 3.1.0. It allows XSS via theme color-code values.
{
"nvd_published_at": "2020-06-19T20:15:00Z",
"severity": "MODERATE",
"github_reviewed_at": "2025-10-22T19:52:12Z",
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true
}