CVEvulnerability

CVE-2026-26233

6.5 MEDIUM Published 2026-03-25 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-03-25
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-400

Description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to rate limit login requests which allows unauthenticated remote attackers to cause denial of service (server crash and restart) via HTTP/2 single packet attack with 100+ parallel login requests.. Mattermost Advisory ID: MMSA-2025-00566

Affected configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.12) • mattermost mattermost server (>= 11.2.0 < 11.2.4) • mattermost mattermost server (>= 11.3.0 < 11.3.2) • mattermost mattermost server (>= 11.4.0 < 11.4.1)

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References