What is GHSA-fpcr-4rr5-hpcp?

GHSA-fpcr-4rr5-hpcp is a security advisory published by GitHub Security Advisories with High severity. Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used

Which CVE IDs does GHSA-fpcr-4rr5-hpcp cover?

GHSA-fpcr-4rr5-hpcp covers the following CVE IDs: CVE-2017-18906. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-fpcr-4rr5-hpcp?

GHSA-fpcr-4rr5-hpcp has a CVSS v3 base score of 8.1, published by GitHub Security Advisories.

Which products are affected by GHSA-fpcr-4rr5-hpcp?

GHSA-fpcr-4rr5-hpcp affects 2 products, including: go/github.com/mattermost/mattermost-server:\u003c 3.9.2-0.20170714134023-b17fca0d5ee7; go/github.com/mattermost/mattermost-server:\u003e= 3.10.0, \u003c 3.10.2.

GHSA-fpcr-4rr5-hpcpHighCVSS 8.1

Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

February 10, 2026

🔗 CVE IDs covered (1)

CVE-2017-18906 →

📋 Description

An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when Single Sign-On OAuth2 is used. An attacker could claim somebody else's account.

🎯 Affected products2

go/github.com/mattermost/mattermost-server:< 3.9.2-0.20170714134023-b17fca0d5ee7
go/github.com/mattermost/mattermost-server:>= 3.10.0, < 3.10.2

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2017-18906
https://github.com/mattermost/mattermost/commit/259ad46f30d0fac2f7c5c14f3b76b2170f7e90c7
https://github.com/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f
https://github.com/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-fpcr-4rr5-hpcp