CVE-2026-2456

MediumCVSS 5.7/10Last modified Jun 17, 2026

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the size of responses from integration action endpoints, which allows an authenticated attacker to cause server memory exhaustion and denial of service via a malicious integration server that returns an arbitrarily large response when a user clicks an interactive message button.. Mattermost Advisory ID: MMSA-2026-00571

Metrics

CVSS 3.1 5.7/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-789

Affected software

No affected versions have been published.

Timeline

Published
Mar 16, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-2456: Medium severity, CVSS 5.7 | Vulnix