CVE-2026-6346 HIGH

CVE-2026-6346: Sensitive credentials exposed in plaintext in Mattermost support packets

Vendor Mattermost
Product Mattermost
Weakness CWE-200 · Info exposure
Published May 18, 2026
Last update May 18, 2026
View on NVD All CVEs

CVSS base score

8.7/10
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:C/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 to sanitize sensitive configuration fields before including them in support packet generation, which allows a Mattermost System Admin or any party with access to a support packet to obtain sensitive credentials in plaintext via downloading a support packet from the System Console.. Mattermost Advisory ID: MMSA-2026-00607

Key dates

02Disclosure timeline

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

Related vulnerabilities

04Related CVE

CVE-2025-8484 Code Quality Control Tool <= 2.1 - Unauthenticated Information Exposure via Log Files CVE-2026-41032 Phoenix Contact: Unauthenticated log download vulnerability in the firmware of CHARX SEC-3xxx charging controllers CVE-2019-5641 Rapid7 InsightVM Information Disclosure after Logout CVE-2025-30222 Shescape has potential environment variable exposure on Windows with CMD CVE-2026-34088 RecentChanges entries expose suppressed content via generated log page html