CVEvulnerability

CVE-2026-6333

5.0 MEDIUM Published 2026-05-18 Modified 2026-10-14 Official page ↗
Status
Analyzed
Published
2026-05-18
Last modified
2026-10-14
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.5 LOW — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
CVSS 3.1 ([email protected])
5.0 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Weaknesses
CWE-918

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost Advisory ID: MMSA-2026-00582

Affected configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.14) • mattermost mattermost server (>= 11.5.0 < 11.5.2)

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References