CVE-2026-5308
Mattermost doesn't enforce request body size limits on plugin HTTP endpoints in github.com/mattermost/mattermost-plugin-github
7.5
HIGH
CVSS 3.1
EPSS 0.25%
Description
Mattermost doesn't enforce request body size limits on plugin HTTP endpoints in github.com/mattermost/mattermost-plugin-github
How to fix CVE-2026-5308
To remediate CVE-2026-5308, upgrade the affected package to a fixed version below.
- Go/github.com/mattermost/mattermost-plugin-github—upgrade to 1.0.1-0.20260410143745-9b41b1fd43c4 or later
- —upgrade to 1.0.1-0.20260410143745-9b41b1fd43c4 or later
- —upgrade to 11.6.1 or later
- —upgrade to 10.11.15+incompatible or later
Is CVE-2026-5308 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.0.1-0.20260410143745-9b41b1fd43c4
- from 0, < 1.0.1-0.20260410143745-9b41b1fd43c4
- >= 11.6.0, < 11.6.1
- >= 10.11.0+incompatible, < 10.11.15+incompatible, >= 11.4.0+incompatible, < 11.4.5+incompatible, >= 11.5.0+incompatible, < 11.5.4+incompatible, >= 11.6.0+incompatible, < 11.6.1+incompatible
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |