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
CVSS 3.5EPSS 0.13699999999999998%Risk 0.35
View source- Published
- 2026-05-18 09:16:23
- Affected versions
- <= 11.5.1, <= 10.11.13
- Type
- Core software
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N