Description
Mattermost versions 9.11.x <= 9.11.6, 10.4.x <= 10.4.1 fail to invalidate all active sessions when converting a user to a bot, with allows the converted user to escalate their privileges depending on the permissions granted to the bot.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 9.11.0 – ≤ 9.11.6, 10.4.0 – ≤ 10.4.1 | 10.5.0 |
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 | 0.0.20250312T181707-1.1 | openSUSE-SU-2025:14889-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 9.11.0-rc1+incompatible, < 9.11.7+incompatible · >= 10.4.0-rc1+incompatible, < 10.4.2+incompatible | 9.11.7+incompatible, 10.4.2+incompatible | GO-2025-3482 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-3482 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3482 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20241217145510-faa7e4f2ea0c | 8.0.0-20241217145510-faa7e4f2ea0c | GHSA-rhvr-6w8c-6v7w |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.4.0-rc1, < 10.4.2 | 10.4.2 | GHSA-rhvr-6w8c-6v7w |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.11.0-rc1, < 9.11.7 | 9.11.7 | GHSA-rhvr-6w8c-6v7w |
Advisories 3
- openSUSE-SU-2025:14889-1 govulncheck-vulndb-0.0.20250312T181707-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0187 Mattermost: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 24, 2025
- NCSC-2025-0068 Kwetsbaarheden verholpen in Mattermost NCSC-NL (Netherlands) · Feb 24, 2025