Description
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to validate user permissions when creating Jira issues from Mattermost posts, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to via the /create-issue API endpoint by providing the post ID of an inaccessible post.. Mattermost Advisory ID: MMSA-2025-00550
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 11.1.0 – ≤ 11.1.2, 10.11.0 – ≤ 10.11.9, 11.2.0 – ≤ 11.2.1 | 11.3.0 |
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 | 0.0.20260226T182644-150000.1.149.1 | SUSE-SU-2026:0757-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 11.2.0, < 11.2.2 | 11.2.2 | GHSA-9pj7-jh2r-87g8 |
| Go | github.com/mattermost/mattermost-server | >= 11.1.0, < 11.1.3 | 11.1.3 | GHSA-9pj7-jh2r-87g8 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0, < 10.11.10 | 10.11.10 | GHSA-9pj7-jh2r-87g8 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0+incompatible, < 10.11.10+incompatible · >= 11.1.0+incompatible, < 11.1.3+incompatible · >= 11.2.0+incompatible, < 11.2.2+incompatible | 10.11.10+incompatible, 11.1.3+incompatible, 11.2.2+incompatible | GO-2026-4496 |
Advisories 2
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:0757-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 4, 2026
References
- MMSA-2025-00550 vendor-advisory