GitHub Advisoryadvisory · Go

GHSA-m5rv-56xx-hfc6 Mattermost fails to properly handle very long passwords

HIGH Published 2026-03-16 Modified 2026-03-17 Official page ↗
Aliases
CVE-2026-24458
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-770
Reviewed
2026-03-17

Affected packages

• Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20260129164748-7201f42d955f → fixed in 8.0.0-20260129164748-7201f42d955f • Go github.com/mattermost/mattermost-server: < 5.3.2-0.20260129164748-7201f42d955f → fixed in 5.3.2-0.20260129164748-7201f42d955f • Go github.com/mattermost/mattermost-server: >= 10.11.0-rc1, < 10.11.11 → fixed in 10.11.11 • Go github.com/mattermost/mattermost-server: >= 11.2.0-rc1, < 11.2.3 → fixed in 11.2.3 • Go github.com/mattermost/mattermost-server: >= 11.3.0-rc1, < 11.3.1 → fixed in 11.3.1

Description

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

Related

Alias · CVE (1)

  • CVE-2026-24458 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… vulnerability

Weakness · CWE (1)

  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References