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CVE PROGRAM SOURCE RECORD3.7 Low

CVE-2026-21388

Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}} Webhook Endpoint

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Status
Published
Published
Updated
Assigning organization
Mattermost

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 0 to ≤ 2.3.1affected
  • 2.3.2.0unaffected

References