GitHub Advisoryadvisory · Go

GHSA-3mw5-466q-295q Mattermost allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration

MEDIUM Published 2026-03-26 Modified 2026-03-31 Official page ↗
Aliases
CVE-2026-3112
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Weaknesses
CWE-22
Reviewed
2026-03-31

Affected packages

• Go github.com/mattermost/mattermost/server/v8: >= 11.4.0-rc1, < 11.4.1 → fixed in 11.4.1 • Go github.com/mattermost/mattermost/server/v8: >= 11.3.0-rc1, < 11.3.2 → fixed in 11.3.2 • Go github.com/mattermost/mattermost/server/v8: >= 11.2.0-rc1, < 11.2.4 → fixed in 11.2.4 • Go github.com/mattermost/mattermost/server/v8: >= 10.11.0-rc1, < 10.11.12 → fixed in 10.11.12 • Go github.com/mattermost/mattermost/server/v8: >= 8.0.0-20260105080200-d27a2195068d, < 8.0.0-20260217110922-b7d4a1f1f59b → fixed in 8.0.0-20260217110922-b7d4a1f1f59b

Description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562.

Related

Alias · CVE (1)

  • CVE-2026-3112 Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target… vulnerability

Weakness · CWE (1)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References