What is GHSA-9rr5-q43r-ccv4?

GHSA-9rr5-q43r-ccv4 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost Server does not prevent System Admin from arbitrary file creation

Which CVE IDs does GHSA-9rr5-q43r-ccv4 cover?

GHSA-9rr5-q43r-ccv4 covers the following CVE IDs: CVE-2017-18875. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-9rr5-q43r-ccv4?

GHSA-9rr5-q43r-ccv4 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-rc1.0.20171004154238-fadd9514f6e7, \u003c 4.2.1-0.20171004194140-6d3cb2ce07fc; go/github.com/mattermost/mattermost-server:\u003e= 4.3.0-rc1, \u003c 4.3.0.

GHSA-9rr5-q43r-ccv4Medium

Mattermost Server does not prevent System Admin from arbitrary file creation

Vendor

GitHub Security Advisories

Published

May 24, 2022

Last Modified

December 4, 2025

🔗 CVE IDs covered (1)

CVE-2017-18875 →

📋 Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used. A System Admin can create arbitrary files.

🎯 Affected products3

go/github.com/mattermost/mattermost-server:< 4.1.2-0.20171004201910-6be8113eb60c
go/github.com/mattermost/mattermost-server:>= 4.2.0-rc1.0.20171004154238-fadd9514f6e7, < 4.2.1-0.20171004194140-6d3cb2ce07fc
go/github.com/mattermost/mattermost-server:>= 4.3.0-rc1, < 4.3.0

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2017-18875
https://github.com/mattermost/mattermost/commit/6be8113eb60cf5ddd2dc1c3f4db05cae0c183086
https://github.com/mattermost/mattermost/commit/6d3cb2ce07fc799832081e93843b405b390057fa
https://github.com/mattermost/mattermost/commit/fadd9514f6e71590aba781a7035e1de4150137b0
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-9rr5-q43r-ccv4