Go/github.com/mattermost/mattermost-server CVE-2026-2456: medium 5.3, EPSS 0.17%
Mattermost fails to limit the size of responses from integration action endpoints
Action: Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20260127165411-fe3052073dc6 or later.
go get github.com/mattermost/mattermost-server@v5.3.2-0.20260127165411-fe3052073dc6go get github.com/mattermost/mattermost-server@v10.11.11go get github.com/mattermost/mattermost-server@v11.2.3go get github.com/mattermost/mattermost-server@v11.3.1Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 5.3.2-0.20260127165411-fe3052073dc6 | - |
| 10.11.0-rc1 | 10.11.11 | - |
| 11.2.0-rc1 | 11.2.3 | - |
| 11.3.0-rc1 | 11.3.1 | - |
Fixed versions
| 5.3.2-0.20260127165411-fe3052073dc6 | 10.11.11 | 11.2.3 | 11.3.1 |
Sources
- osv: GHSA-34g8-9fpp-46ch#Go/github.com/mattermost/mattermost-server
- https://nvd.nist.gov/vuln/detail/CVE-2026-2456
- https://github.com/mattermost/mattermost/commit/fe3052073dc67e3c920baf9fe7efd44ac1d8124c
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-2456 · published · modified · JSON