Mattermost fails to use innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victims page by create a channel name that is valid HTML. No XSS is possible though.
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mattermost | Mattermost | * | 7.8.12 (including) |
| Mattermost | Mattermost | 8.0.0 (including) | 8.1.3 (including) |