CVE-2026-6333
Low · 3.5CVSS
3.5
EPSS
0.1%
Published
May 18, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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