CVE catalog
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 commands terminal output which allows attackers
- Severity
- High · CVSS 8.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.28% · Oct 25, 2026
A flaw was found in Mattermost. This vulnerability in the `mmctl` command-line interface allows attackers to manipulate administrator terminals. By sending specially crafted messages containing ANSI and Operating System Command (OSC) escape sequences, an attacker can enable screen manipulation, display fake prompts, and hijack the administrator's clipboard, potentially exposing sensitive information or tricking administrators into executing malicious commands. Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | mattermost_server | Not reported | 10.11.11 | fixed |
| Cpe | mattermost_server | Not reported | 11.2.3 | fixed |
| Cpe | mattermost_server | Not reported | 11.3.2 | fixed |
| Cpe | mattermost_server | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | mattermost_server | cpe | Not reported | 10.11.11 | Not reported | Not reported | Not reported |
| Cpe | mattermost_server | cpe | Not reported | 11.2.3 | Not reported | Not reported | Not reported |
| Cpe | mattermost_server | cpe | Not reported | 11.3.2 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: