Stored Password Disclosure Vulnerability in Mattermost by Mattermost
CVE-2026-19601

4.9MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 October 2026

What is CVE-2026-19601?

In certain versions of Mattermost, a security flaw exists that fails to invalidate stored Active Directory/LDAP bind passwords when other connection settings are modified. This oversight allows System Console administrators to inadvertently expose plaintext bind passwords to potential attackers through the Test Connection and diagnostics feature. Users of Mattermost versions 11.9.x, 11.8.x, 11.7.x, and 11.10.x should take immediate action to mitigate this risk to protect sensitive credentials.

Affected Version(s)

Mattermost 11.9.0 <= 11.9.1

Mattermost 11.8.0 <= 11.8.5

Mattermost 11.7.0 <= 11.7.10

References

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

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Juho Forsén
.