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.
{ "nvd_published_at": "2023-11-27T10:15:07Z", "cwe_ids": [ "CWE-74" ], "severity": "LOW", "github_reviewed": true, "github_reviewed_at": "2023-11-28T20:50:03Z" }