HIGH8.8
GO-2026-4305
Mattermost Server vulnerable to CSRF if CORS is enabled in github.com/mattermost/mattermost-server
Quick fix
GO-2026-4305 — 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 CSRF if CORS is enabled in github.com/mattermost/mattermost-server.
NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.
(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)
The additional affected modules and versions are: .
Are you affected?
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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-fcwg-45jh-5qhf[ADVISORY]
- https://nvd.nist.gov/vuln/detail/CVE-2017-18903[ADVISORY]
- https://github.com/mattermost/mattermost/commit/312269ad0bd166174f07f9df7391fce714601600[WEB]
- https://github.com/mattermost/mattermost/commit/4519b03d95e8bfe1b2f74094673ae1a2f39f6b47[WEB]
- https://github.com/mattermost/mattermost/commit/a18479df0940be8503c9b88993490741793eba9e[WEB]
- https://mattermost.com/security-updates[WEB]