CVE-2026-6345 MEDIUM

CVE-2026-6345: Prevent password disclosure and force reset during Slack import

Vendor Mattermost
Product Mattermost
Weakness CWE-522 · Insufficiently protected credentials
Published May 18, 2026
Last update May 19, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

What the vulnerability does

01Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail 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

Key dates

02Disclosure timeline

May 18, 2026 CVE published
May 19, 2026 Record updated