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CVE-2017-18915

CRITICAL

Mattermost Server server restarts may provide attackers with API access

Published May 24, 2022Updated February 19, 2026Source: osv

Summary

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. After a restart of a server, an attacker might suddenly gain API Endpoint access.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/mattermost/mattermost-server to 3.6.7-0.20170420152529-0968e4079e0a or later
go get github.com/mattermost/mattermost-server@v3.6.7-0.20170420152529-0968e4079e0a
Go
Update github.com/mattermost/mattermost-server to 3.7.5 or later
go get github.com/mattermost/mattermost-server@v3.7.5
Go
Update github.com/mattermost/mattermost-server to 3.8.2 or later
go get github.com/mattermost/mattermost-server@v3.8.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

PackageEcosystemAffectedFixed In
github.com/mattermost/mattermost-server
go
All versions3.6.7-0.20170420152529-0968e4079e0a
github.com/mattermost/mattermost-server
go
All versions3.7.5
github.com/mattermost/mattermost-server
go
All versions3.8.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2017-18915?
Mattermost Server server restarts may provide attackers with API access This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2017-18915?
CVE-2017-18915 affects github.com/mattermost/mattermost-server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2017-18915 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-hxxj-8phw-74vw
GO-2026-4462

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