CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}} Webhook Endpoint
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-770 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Apr 9, 2026 |
| Last Updated | Apr 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Mattermost / Mattermost
0 ≤ 2.3.1
Credits
Lorenzo Gallegos