What is GHSA-jp57-4x34-5v94?

GHSA-jp57-4x34-5v94 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost Server is vulnerable to webhook and slash command manipulation

Which CVE IDs does GHSA-jp57-4x34-5v94 cover?

GHSA-jp57-4x34-5v94 covers the following CVE IDs: CVE-2017-18889. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-jp57-4x34-5v94?

GHSA-jp57-4x34-5v94 has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

Which products are affected by GHSA-jp57-4x34-5v94?

GHSA-jp57-4x34-5v94 affects 3 products, including: go/github.com/mattermost/mattermost-server:\u003c 4.1.2; go/github.com/mattermost/mattermost-server:\u003e= 4.2.0-rc1, \u003c 4.2.1; go/github.com/mattermost/mattermost-server:\u003e= 4.3.0-rc1, \u003c 4.3.0.

GHSA-jp57-4x34-5v94MediumCVSS 4.3

Mattermost Server is vulnerable to webhook and slash command manipulation

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

December 5, 2025

🔗 CVE IDs covered (1)

CVE-2017-18889 →

📋 Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. An attacker could create fictive system-message posts via webhooks and slash commands, in the v3 or v4 REST API.

🎯 Affected products3

go/github.com/mattermost/mattermost-server:< 4.1.2
go/github.com/mattermost/mattermost-server:>= 4.2.0-rc1, < 4.2.1
go/github.com/mattermost/mattermost-server:>= 4.3.0-rc1, < 4.3.0

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2017-18889
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-jp57-4x34-5v94