CVE-2026-5308
HIGH WAF: Medium
CVSS 7.5
Published: 2026-05-22
CWE-400
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to enforce request body size limits on plugin HTTP endpoints which allows an attacker to cause a denial of service via crafted oversized HTTP requests.. Mattermost Advisory ID: MMSA-2026-00646
WAF Coverage Analysis
Uncontrolled Resource Consumption
Medium WAF Coverage
OWASP: A05:2021 Security Misconfiguration
912xxx - DOS Protection
Affected Software
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 - 10.11.15 |
| mattermost | mattermost_server | 11.4.0 - 11.4.5 |
| mattermost | mattermost_server | 11.5.0 - 11.5.4 |
| mattermost | mattermost_server | 11.6.0 - 11.6.1 |
References
- mattermost.com (Vendor Advisory)