CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}} Webhook Endpoint
- State
- Published
- Severity
- 3.7 Low
- Published
- Apr 9, 2026
- Updated
- Apr 9, 2026
- Reserved
- Feb 11, 2026
Description
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L | Mattermost |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
MattermostMattermost |
|
References
- MMSA-2026-00610vendor-advisory
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