CVE-2025-21088 | Mattermost up to 9.11.5/10.0.3/10.1.3 post.props.attachments type conversion

CVE-2025-21088 | Mattermost up to 9.11.5/10.0.3/10.1.3 post.props.attachments type conversion

A vulnerability was found in Mattermost up to 9.11.5/10.0.3/10.1.3 and classified as problematic. This issue affects the function post.props.attachments. The manipulation leads to incorrect type conversion. The identification of this vulnerability is CVE-2025-21088. The attack may be initiated remotely. There is no exploit available. It is recommended to upgrade the affected component.