What is GHSA-498j-wxww-j897?

GHSA-498j-wxww-j897 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost Server is vulnerable to XSS through author_link field in Slack attachments

Which CVE IDs does GHSA-498j-wxww-j897 cover?

GHSA-498j-wxww-j897 covers the following CVE IDs: CVE-2017-18879. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-498j-wxww-j897?

GHSA-498j-wxww-j897 has a CVSS v3 base score of 6.1, published by GitHub Security Advisories.

Which products are affected by GHSA-498j-wxww-j897?

GHSA-498j-wxww-j897 affects 3 products, including: go/github.com/mattermost/mattermost-server:\u003c 4.1.2; go/github.com/mattermost/mattermost-server:\u003e= 4.2.0, \u003c 4.2.1; go/github.com/mattermost/mattermost-server:\u003e= 4.3.0-rc1, \u003c 4.3.0.

GHSA-498j-wxww-j897MediumCVSS 6.1

Mattermost Server is vulnerable to XSS through author_link field in Slack attachments

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

December 5, 2025

🔗 CVE IDs covered (1)

CVE-2017-18879 →

📋 Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. XSS could occur via the author_link field of a Slack attachment.

🎯 Affected products3

go/github.com/mattermost/mattermost-server:< 4.1.2
go/github.com/mattermost/mattermost-server:>= 4.2.0, < 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-2017-18879
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-498j-wxww-j897