PT-2026-25699 · Mattermost · Mattermost

Winfunc · Published 2026-03-16 · Updated 2026-03-16 · CVE-2026-24458

NVD

CVSS v3.1

7.5

7.5

High

Base vector

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

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

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-24458

Affected Products

Mattermost

References · 3

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-24458 · Security Note
• https://twitter.com/CVEnew/status/2033583647123800280 · Twitter Post