What is GHSA-9589-mq83-f749?

GHSA-9589-mq83-f749 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost Server is vulnerable to DoS through maliciously crafted posts

Which CVE IDs does GHSA-9589-mq83-f749 cover?

GHSA-9589-mq83-f749 covers the following CVE IDs: CVE-2017-18898. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-9589-mq83-f749?

GHSA-9589-mq83-f749 has a CVSS v3 base score of 5.3, published by GitHub Security Advisories.

Which products are affected by GHSA-9589-mq83-f749?

GHSA-9589-mq83-f749 affects 3 products, including: go/github.com/mattermost/mattermost-server:\u003c 4.0.5; go/github.com/mattermost/mattermost-server:\u003e= 4.1.0, \u003c 4.1.1; go/github.com/mattermost/mattermost-server:\u003e= 4.2.0-rc1, \u003c 4.2.0.

GHSA-9589-mq83-f749MediumCVSS 5.3

Mattermost Server is vulnerable to DoS through maliciously crafted posts

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

January 12, 2026

🔗 CVE IDs covered (1)

CVE-2017-18898 →

📋 Description

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows crafted posts that potentially cause a web browser to hang.

🎯 Affected products3

go/github.com/mattermost/mattermost-server:< 4.0.5
go/github.com/mattermost/mattermost-server:>= 4.1.0, < 4.1.1
go/github.com/mattermost/mattermost-server:>= 4.2.0-rc1, < 4.2.0

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2017-18898
https://github.com/grundleborg/mattermost/commit/5286318c72aa230f33f89df3b4cbdc33a0822a93
https://github.com/mattermost/mattermost/commit/5bf6f06c02c368b9c73a8be2d2d8795b3405b22b
https://github.com/mattermost/mattermost/commit/5c22176c963a7393241872073547f30083efe218
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-9589-mq83-f749