Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 doesn't prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614
{
"nvd_published_at": "2026-05-18T09:16:23Z",
"cwe_ids": [
"CWE-522"
],
"severity": "MODERATE",
"github_reviewed": true,
"github_reviewed_at": "2026-06-01T15:34:40Z"
}