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CVE-2017-18900 — Vulnerability in...

CRITICAL

Mattermost Server is vulnerable CSV Injection

Published May 24, 2022Updated February 3, 2026Source: osv

Summary

An issue was discovered in Mattermost Server before 4.0.4 and 3.10.3. It allows CSV injection via a compliance report.

Advisory Timeline

  • First published May 24, 2022 (1602 days ago).
  • Last revised February 3, 2026 — 1350 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/mattermost/mattermost-server to 3.10.3 or later
go get github.com/mattermost/mattermost-server@v3.10.3
Go
Update github.com/mattermost/mattermost-server to 4.0.3 or later
go get github.com/mattermost/mattermost-server@v4.0.3

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

Affected Packages (2)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
github.com/mattermost/mattermost-server
go
All versions3.10.3
github.com/mattermost/mattermost-server
go
All versions4.0.3

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-2017-18900?
Mattermost Server is vulnerable CSV Injection 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-2017-18900?
CVE-2017-18900 affects github.com/mattermost/mattermost-server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2017-18900 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-8q4v-35v6-g8wr
GO-2026-4303

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