Description
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.9 fail to restrict domains the LLM can request to contact upstream which allows an authenticated user to exfiltrate data from an arbitrary server accessible to the victim via performing a prompt injection in the AI plugin's Jira tool.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.4.0 – ≤ 10.4.2, 10.5.0, 9.11.0 – ≤ 9.11.9 | 10.6.0 |
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 | 0.0.20250422T181640-1.1 | openSUSE-SU-2025:15017-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 9.11.0+incompatible, < 9.11.10+incompatible · >= 10.4.0+incompatible, < 10.4.3+incompatible · >= 10.5.0+incompatible, < 10.5.1+incompatible | 9.11.10+incompatible, 10.4.3+incompatible, 10.5.1+incompatible | GO-2025-3622 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-3622 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3622 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.5.0, < 10.5.1 | 10.5.1 | GHSA-9h6j-4ffx-cm84 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.4.0, < 10.4.3 | 10.4.3 | GHSA-9h6j-4ffx-cm84 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.11.0, < 9.11.10 | 9.11.10 | GHSA-9h6j-4ffx-cm84 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250218121836-2b5275d87136 | 8.0.0-20250218121836-2b5275d87136 | GHSA-9h6j-4ffx-cm84 |
Advisories 1
- openSUSE-SU-2025:15017-1 govulncheck-vulndb-0.0.20250422T181640-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026