Terminal Escape Injection in mmctl Report Posts Command

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-3108
StatePUBLISHED
AssignerMattermost
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-26 17:16:41 UTC
Updated2026-03-30 19:45:27 UTC
DescriptionMattermost 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

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-150 | CWE-150 CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary8HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
3.1CNACVSS8HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mattermost Mattermost Server All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mattermost Mattermost affected 11.2.0 11.2.2 semver Not specified
CNA Mattermost Mattermost affected 10.11.0 10.11.10 semver Not specified
CNA Mattermost Mattermost affected 11.4.0 11.4.0 semver Not specified
CNA Mattermost Mattermost affected 11.3.0 11.3.1 semver Not specified
CNA Mattermost Mattermost unaffected 11.5.0 Not specified
CNA Mattermost Mattermost unaffected 11.2.3 Not specified
CNA Mattermost Mattermost unaffected 10.11.11 Not specified
CNA Mattermost Mattermost unaffected 11.4.1 Not specified
CNA Mattermost Mattermost unaffected 11.3.2 Not specified

References

ReferenceSourceLinkTags
mattermost.com/security-updates [email protected] mattermost.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: winfunc (en)

Additional Advisory Data

Solutions

CNA: Update Mattermost to versions 11.5.0, 11.2.3, 10.11.11, 11.4.1, 11.3.2 or higher.

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