Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though.
{
"severity": "LOW",
"github_reviewed": true,
"cwe_ids": [
"CWE-74"
],
"nvd_published_at": "2023-11-27T10:15:07Z",
"github_reviewed_at": "2023-11-28T20:50:03Z"
}