Description
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.2.0 – ≤ 10.2.0, 9.11.0 – ≤ 9.11.5, 10.0.0 – ≤ 10.0.3, 10.1.0 – ≤ 10.1.3 | 10.3.0 |
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.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | govulncheck-vulndb | 0.0.20250128T150132-150000.1.29.1 | SUSE-SU-2025:0297-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20250117T214834-1.1 | openSUSE-SU-2025:14704-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20250128T150132-150000.1.29.1 | SUSE-SU-2025:0297-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 9.11.0+incompatible, < 9.11.6+incompatible · >= 10.0.0+incompatible, < 10.0.4+incompatible · >= 10.1.0+incompatible, < 10.1.4+incompatible · >= 10.2.0+incompatible, < 10.2.1+incompatible | 9.11.6+incompatible, 10.0.4+incompatible, 10.1.4+incompatible, 10.2.1+incompatible | GO-2025-3407 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-3407 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3407 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.2.0, < 10.2.1 | 10.2.1 | GHSA-w6xh-c82w-h997 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.1.0, < 10.1.4 | 10.1.4 | GHSA-w6xh-c82w-h997 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.0.0, < 10.0.4 | 10.0.4 | GHSA-w6xh-c82w-h997 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 9.11.0, < 9.11.6 | 9.11.6 | GHSA-w6xh-c82w-h997 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20241127161322-25ff7a3779a5 | 8.0.0-20241127161322-25ff7a3779a5 | GHSA-w6xh-c82w-h997 |
Advisories 2
- SUSE-SU-2025:0297-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Feb 5, 2026
- openSUSE-SU-2025:14704-1 govulncheck-vulndb-0.0.20250117T214834-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026