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CVE-2026-6346

Sensitive credentials exposed in plaintext in Mattermost support packets

Published: May 18, 2026Updated: May 18, 2026 Sources: CVE List NVDCWE-200
NVD MITRE
8.7CVSSHIGH
EPSS Score
0.3%
Top 79.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-200

Affected Products

MattermostMattermost
On-premWeb App
Communications / messaging-chat
mattermost servermattermost
On-premWeb App
Communications / messaging-chat
mattermostcommercialUSCommunications

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://mattermost.com/security-updates
mattermost.com

Timeline

Published
May 18, 2026
Last Updated
May 18, 2026

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