mattermost/mattermost-plugin-msteams · Security
Mattermost MS Teams plugin doesn't limit the request body size on the /lifecycle webhook endpoint
- GHSA ID
- GHSA-x274-8qfc-hrgf
- CVE ID
- CVE-2026-21388
- Severity
- low
- Published
- Updated
- CVSS
- 3.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- CVSS v3
- 3.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
CWEs
- CWE-770 · Allocation of Resources Without Limits or Throttling
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-21388 ↗
- https://mattermost.com/security-updates ↗
- https://github.com/mattermost/mattermost-plugin-msteams/commit/6fe4d295592ecc8767d67e69286cbeec01be3210 ↗
- https://github.com/mattermost/mattermost-plugin-msteams/releases/tag/v2.3.2 ↗
- https://github.com/advisories/GHSA-x274-8qfc-hrgf ↗