Mattermost versions 11.0.x < 11.0.4, 10.12.x <= 10.12.2, 10.11.x < 10.11.6 and Mattermost Calls versions < 1.10.0 fail to implement CSRF protection on the Calls widget page which allows an authenticated attacker to initiate calls and inject messages into channels or direct messages via a malicious webpage or crafted link.
{
"nvd_published_at": "2025-12-17T13:15:58Z",
"cwe_ids": [
"CWE-352"
],
"severity": "MODERATE",
"github_reviewed": true,
"github_reviewed_at": "2025-12-20T17:10:28Z"
}