🛡️ CVE-2026-2456
🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-789 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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

Details

Severity Medium
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE CWE-789
Public Exploit ✅ No
Source NVD
Published 2026-03-16
Updated 2026-06-15
Modified 2026-03-26
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/mattermost/mattermost-server
github.com/mattermost/mattermost-server/v5
github.com/mattermost/mattermost-server/v6
github.com/mattermost/mattermost/server/v8
mattermost-server 11.3.0 11.3.1

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