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CVE-2026-21388

—
CVSS 3.1
6.5 medium
EPSS
<1%p24
Published
()
Modified
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

Vendors
mattermost
Products
mattermost server
Weakness
CWE-770
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD CVE.org GitHub PoCs EPSS (0.3%)

In the news

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