MEDIUM6.1
GO-2026-4302
Mattermost Server vulnerable to XSS via an uploaded file in github.com/mattermost/mattermost-server
Quick fix
GO-2026-4302 — github.com/mattermost/mattermost-server: upgrade to the fixed version with the command below.
go get github.com/mattermost/mattermost-server@v3.9.2+incompatibleDetails
Mattermost Server vulnerable to XSS via an uploaded file in github.com/mattermost/mattermost-server
Are you affected?
Enter the version of the package you're using.
Affected packages
Go/github.com/mattermost/mattermost-server
Introduced in:
0Fixed in: 3.9.2+incompatibleFix
go get github.com/mattermost/mattermost-server@v3.9.2+incompatibleReferences
- https://github.com/advisories/GHSA-8pff-p3gx-w4jf[ADVISORY]
- https://nvd.nist.gov/vuln/detail/CVE-2017-18904[ADVISORY]
- https://github.com/mattermost/mattermost/commit/6a2754376c8c8270be5e11e3fdab589659d0cc8d[WEB]
- https://github.com/mattermost/mattermost/commit/bde06a7bc3a03a56da224c1ffcd8bffb0af8071b[WEB]
- https://github.com/mattermost/mattermost/commit/f06c5bef4d78966c60b153bbec6eea4ec0be9e68[WEB]
- https://mattermost.com/security-updates[WEB]