Denial of Service via Oversized Payload in Mattermost Plugins

Publication date: 2026-04-09

Last updated on: 2026-04-17

Assigner: Mattermost, Inc.

Description

Mattermost Plugins versions <=2.1.3.0 fail to limit the request body size on the {{/changes}} 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-2026-00611

CVSS Scores

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Meta Information

Published

2026-04-09

Last Modified

2026-04-17

Generated

2026-07-06

AI Q&A

2026-04-09

EPSS Evaluated

2026-07-05

NVD

CVE-2026-24661

EUVD

EUVD-2026-20882

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost	to 2.3.2.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-770	The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Mattermost Plugins versions up to 2.1.3.0 where the {{/changes}} webhook endpoint does not limit the size of the request body. An authenticated attacker can exploit this by sending an oversized JSON payload, which can cause memory exhaustion and lead to a denial of service.

Impact Analysis

The impact of this vulnerability is primarily a denial of service condition. By sending an oversized JSON payload to the vulnerable endpoint, an attacker can exhaust the server's memory resources, potentially causing the service to crash or become unresponsive.

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