QwikSec

Security Database

CVE

CWE

Training

CVE Database
/

CVE-2026-6333

Back to search

CVE-2026-6333

Published: May 18, 2026

Modified: May 19, 2026

PUBLISHED

CVSS v3.1

3.5

LOW

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

VendorProductVersions

Mattermost

Mattermost

affected
11.5.0 - <= 11.5.1
affected
10.11.0 - <= 10.11.13
unaffected
11.6.0
unaffected
11.5.2
unaffected
10.11.14

Weaknesses (CWE)

CWE-918

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

References

MMSA-2026-00582
vendor-advisory

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Start Training

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.

Scan Now