CVE-2026-5308
HIGH EPSS 16.6%
Published May 22, 20261mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
Published May 22, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
Description
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
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
16.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| 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 1
- mattermost.com https://mattermost.com/security-updates
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.