User Password Disclosure in Mattermost by Mattermost Inc.
CVE-2026-6345

6.5MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
18 May 2026

What is CVE-2026-6345?

Certain versions of Mattermost exhibit a security flaw that fails to adequately safeguard the disclosure of user-created passwords. This vulnerability enables a malicious individual to impersonate users by exploiting accessible passwords within the affected versions. Proper remediation is essential to maintain the integrity and security of user accounts in the Mattermost platform.

Affected Version(s)

Mattermost 11.5.0 <= 11.5.1

Mattermost 10.11.0 <= 10.11.13

Mattermost 11.4.0 <= 11.4.3

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

eeshan
.