Go/github.com/mattermost/mattermost/server/v8 CVE-2026-4273: medium 4.3, EPSS 0.14%
Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260313190740-742e0be95074 or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260313190740-742e0be95074Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20260313190740-742e0be95074 | - |
Fixed versions
| 8.0.0-20260313190740-742e0be95074 |
Sources
- osv: GO-2026-5432#Go/github.com/mattermost/mattermost/server/v8
- nvd: CVE-2026-4273
- https://github.com/advisories/GHSA-hqpj-f3jh-29vx
- https://github.com/mattermost/mattermost/commit/742e0be9507454a7e662668e1d9ec1b94b636e9b
- https://mattermost.com/security-updates
CVE-2026-4273 · published · modified · JSON