CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2026-21388
Medium (6.5) in mattermost mattermost server. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-plugin-msteams 1.15.1-0.20260213190728-6fe4d295592e.
Mattermost Plugins versions <=2.3.1 fail to limit the request body size on the {{/lifecycle}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00610
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-31)
- CWE
- CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-x274-8qfc-hrgf | Go | github.com/mattermost/mattermost-plugin-msteams | <1.15.1-0.20260213190728-6fe4d295592e | 1.15.1-0.20260213190728-6fe4d295592e |
| GO-2026-5734 | Go | github.com/mattermost/mattermost-plugin-msteams | <1.15.1-0.20260213190728-6fe4d295592e | 1.15.1-0.20260213190728-6fe4d295592e |