Description
Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.5.0 – ≤ 10.5.7, 9.11.0 – ≤ 9.11.16 | 10.9.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20250730T213748-1.1 | openSUSE-SU-2025:15405-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 10.5.0, < 10.5.8 | 10.5.8 | GHSA-4fwj-8595-wp25 |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0, < 9.11.17 | 9.11.17 | GHSA-4fwj-8595-wp25 |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0+incompatible, < 9.11.17+incompatible · >= 10.5.0+incompatible, < 10.5.8+incompatible | 9.11.17+incompatible, 10.5.8+incompatible | GO-2025-3818 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-3818 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3818 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250612074655-8f8612c63783 | 8.0.0-20250612074655-8f8612c63783 | GHSA-4fwj-8595-wp25 |
Advisories 1
- openSUSE-SU-2025:15405-1 govulncheck-vulndb-0.0.20250730T213748-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026