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CVE-2017-18908

CRITICAL

Mattermost Server password reset email requests can be sent to attacker-provided email addresses

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

Summary

An issue was discovered in Mattermost Server before 4.0.0, 3.10.1, and 3.9.1. A password reset request was sometimes sent to an attacker-provided e-mail address.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/mattermost/mattermost-server to 3.9.1-rc1 or later
go get github.com/mattermost/mattermost-server@v3.9.1-rc1
Go
Update github.com/mattermost/mattermost-server to 3.10.1 or later
go get github.com/mattermost/mattermost-server@v3.10.1

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

Affected Packages (2)

PackageEcosystemAffectedFixed In
github.com/mattermost/mattermost-server
go
All versions3.9.1-rc1
github.com/mattermost/mattermost-server
go
All versions3.10.1

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-2017-18908?
Mattermost Server password reset email requests can be sent to attacker-provided email addresses 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-2017-18908?
CVE-2017-18908 affects github.com/mattermost/mattermost-server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2017-18908 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-34cx-hvm4-vx7j
GO-2026-4476

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