CVE-2026-24458 HIGH

CVE-2026-24458: DoS attack via login attempts with multi-megabyte passwords

Vendor Mattermost
Product Mattermost
Weakness CWE-770 · Uncontrolled resource consumption
Published March 16, 2026
Last update March 16, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly handle very long passwords, which allows an attacker to overload the server CPU and memory via executing login attempts with multi-megabyte passwords. Mattermost Advisory ID: MMSA-2026-00587

Key dates

02Disclosure timeline

March 16, 2026 CVE published
March 16, 2026 Record updated