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CVE-2026-3108— Terminal Escape Injection in mmctl Report Posts Command

Quick assessment

Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于未清理用户控制的帖子内容，可能导致攻击者通过特制消息操纵管理员终端。以下版本受到影响：11.2.2及之前的11.2.x版本、10.11.10及之前的10.11.x版本、11.4.0及之前的11.4.x版本和11.3.1及之前的11.3.x版本。

CVSS 8.0 · High EPSS 0.34% · P26
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I. Basic Information for CVE-2026-3108

Vulnerability Information
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Vulnerability Title
Terminal Escape Injection in mmctl Report Posts Command
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
转义、元或控制序列转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost存在安全漏洞，该漏洞源于未清理用户控制的帖子内容，可能导致攻击者通过特制消息操纵管理员终端。以下版本受到影响：11.2.2及之前的11.2.x版本、10.11.10及之前的10.11.x版本、11.4.0及之前的11.4.x版本和11.3.1及之前的11.3.x版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 11.2.0 ~ 11.2.2 -

II. Public POCs for CVE-2026-3108

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III. Intelligence Information for CVE-2026-3108

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Same Patch Batch · Mattermost · 2026-03-26 · 8 CVEs total

CVE-2026-3112 6.8 MEDIUM Arbitrary File Read via Advanced Logging Support Packet
CVE-2026-3114 6.5 MEDIUM Zip Bomb Denial of Service via Unrestricted Archive Decompression
CVE-2026-4274 5.4 MEDIUM Insufficient authorization in shared channel membership sync grants team-level access inst
CVE-2026-3113 5.0 MEDIUM mmctl export download command doesn’t restrict permissions to created file to file owner
CVE-2026-3116 4.9 MEDIUM Improper Input Validation in Zoom Plugin Webhook Handler
CVE-2026-3115 4.3 MEDIUM Guest users can view group member IDs without respecting view restrictions
CVE-2026-3109 2.2 LOW Missing timestamp validation in Zoom webhook handler

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-150

V. Comments for CVE-2026-3108

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