What is GHSA-h564-6gc2-fcc6?

GHSA-h564-6gc2-fcc6 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost Server allows users with a session ID to revoke another users' session

Which CVE IDs does GHSA-h564-6gc2-fcc6 cover?

GHSA-h564-6gc2-fcc6 covers the following CVE IDs: CVE-2017-18878. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-h564-6gc2-fcc6?

GHSA-h564-6gc2-fcc6 has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

Which products are affected by GHSA-h564-6gc2-fcc6?

GHSA-h564-6gc2-fcc6 affects 3 products, including: go/github.com/mattermost/mattermost-server:\u003c 4.1.2-0.20171004201910-6be8113eb60c; go/github.com/mattermost/mattermost-server:\u003e= 4.2.0-rc1, \u003c 4.2.1-0.20171004192657-8fbbd688ea24; go/github.com/mattermost/mattermost-server:\u003e= 4.3.0-rc1, \u003c 4.3.0.

GHSA-h564-6gc2-fcc6MediumCVSS 4.3

Mattermost Server allows users with a session ID to revoke another users' session

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

December 5, 2025

🔗 CVE IDs covered (1)

CVE-2017-18878 →

📋 Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. Knowledge of a session ID allows revoking another user's session.

🎯 Affected products3

go/github.com/mattermost/mattermost-server:< 4.1.2-0.20171004201910-6be8113eb60c
go/github.com/mattermost/mattermost-server:>= 4.2.0-rc1, < 4.2.1-0.20171004192657-8fbbd688ea24
go/github.com/mattermost/mattermost-server:>= 4.3.0-rc1, < 4.3.0

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2017-18878
https://github.com/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086
https://github.com/mattermost/mattermost/commit/8fbbd688ea2466dd0d70e9c07e9703d78f8a19a5
https://github.com/mattermost/mattermost/commit/affd35071ea155069979fd359726296de8aa6aaf
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-h564-6gc2-fcc6