Description
Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enabled and Mattermost Jira plugin versions <=4.4.0 fail to enforce authentication and issue-key path restrictions in the Jira plugin, which allows an unauthenticated attacker who knows a valid user ID to issue authenticated GET and POST requests to the Jira server via crafted plugin payloads that spoof the user ID and inject arbitrary issue key paths. Mattermost Advisory ID: MMSA-2025-00555
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 11.1.0 – ≤ 11.1.0, 11.0.0 – ≤ 11.0.5, 10.12.0 – ≤ 10.12.3, 10.11.0 – ≤ 10.11.7 | 11.2.0 |
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 Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260114T191543-150000.1.137.1 | SUSE-SU-2026:0142-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-jira | < 4.4.1 | 4.4.1 | GHSA-qvmc-92vg-6r35 |
| Go | github.com/mattermost/mattermost-plugin-jira | all versions | — | GO-2026-4275 |
| Go | github.com/mattermost/mattermost-server | all versions | — | GO-2026-4275 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2026-4275 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2026-4275 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20251121122154-b57c297c6d7a | 8.0.0-20251121122154-b57c297c6d7a | GHSA-qvmc-92vg-6r35 |
Advisories 3
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:0142-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 23, 2026
- WID-SEC-2025-2913 Mattermost: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Dec 22, 2025