CVE-2026-3108

published 2026-03-26

CVE-2026-3108: Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl…

Priority P3 54 high 8.8 CVSS 3.1

AV N AC L PR L UI N S U C H I H A H

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences that enable screen manipulation, fake prompts, and clipboard hijacking.. Mattermost Advisory ID: MMSA-2026-00599

Affected

13 ranges

Vendor	Product	Version range	Fixed in
github.com	mattermost_mattermost_server_v8	>= 10.11.0-rc1 < 10.11.11	10.11.11
github.com	mattermost_mattermost_server_v8	>= 11.2.0-rc1 < 11.2.3	11.2.3
github.com	mattermost_mattermost_server_v8	>= 11.3.0-rc1 < 11.3.2	11.3.2
github.com	mattermost_mattermost_server_v8	>= 11.4.0-rc1 < 11.4.1	11.4.1
github.com	mattermost_mattermost_server_v8	>= 8.0.0-20260105080200-d27a2195068d < 8.0.0-20260217110922-b7d4a1f1f59b	8.0.0-20260217110922-b7d4a1f1f59b
mattermost	mattermost	10.11.0 – 10.11.10	—
mattermost	mattermost	11.2.0 – 11.2.2	—
mattermost	mattermost	11.3.0 – 11.3.1	—
mattermost	mattermost	11.4.0 – 11.4.0	—
mattermost	mattermost_server	—	—
mattermost	mattermost_server	>= 10.11.0 < 10.11.11	10.11.11
mattermost	mattermost_server	>= 11.2.0 < 11.2.3	11.2.3
mattermost	mattermost_server	>= 11.3.0 < 11.3.2	11.3.2

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CWE-150