GitHub Advisoryadvisory · Go

GHSA-x274-8qfc-hrgf Mattermost MS Teams plugin doesn't limit the request body size on the /lifecycle webhook endpoint

LOW Published 2026-04-09 Modified 2026-04-29 Official page ↗
Aliases
CVE-2026-21388
Ecosystem
Go
Packages
github.com/mattermost/mattermost-plugin-msteams
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-770
Reviewed
2026-04-29

Affected packages

• Go github.com/mattermost/mattermost-plugin-msteams: < 1.15.1-0.20260213190728-6fe4d295592e → fixed in 1.15.1-0.20260213190728-6fe4d295592e

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.

Related

Alias · CVE (1)

  • CVE-2026-21388 Mattermost Plugins versions <=2.3.1 fail to limit the request body size on the {{/lifecycle}} webhook endpoint which allows an… vulnerability

Weakness · CWE (1)

  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References