CVE-2026-2462
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Unauthorized Plugin Installation in Mattermost Enables Remote Code Execution

Publication date: 2026-03-16

Last updated on: 2026-03-18

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to restrict plugin installation on CI test instances with default admin credentials which allows an unauthenticated attacker to achieve remote code execution and exfiltrate sensitive configuration data including AWS and SMTP credentials via uploading a malicious plugin after changing the import directory. Mattermost Advisory ID: MMSA-2025-00528
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Meta Information
Published
2026-03-16
Last Modified
2026-03-18
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-14
NVD
CVE-2026-2462
EUVD
EUVD-2026-12413
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.11 (exc)
mattermost mattermost_server From 11.2.0 (inc) to 11.2.3 (exc)
mattermost mattermost_server From 11.3.0 (inc) to 11.3.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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Executive Summary

This vulnerability affects certain versions of Mattermost (11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10) where the system fails to restrict plugin installation on continuous integration (CI) test instances that use default admin credentials.

An unauthenticated attacker can exploit this by uploading a malicious plugin after changing the import directory, which allows them to execute remote code and exfiltrate sensitive configuration data such as AWS and SMTP credentials.

Impact Analysis

The vulnerability can lead to remote code execution by an unauthenticated attacker, which means the attacker can run arbitrary code on the affected system.

Additionally, sensitive configuration data including AWS and SMTP credentials can be stolen, potentially leading to further compromise of cloud resources, email systems, and other integrated services.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, you should avoid using default admin credentials on CI test instances of Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, and 10.11.x <= 10.11.10.

Additionally, restrict plugin installation permissions to trusted users only and ensure that the import directory cannot be changed by unauthorized users.

Consider upgrading to a fixed version of Mattermost once available or applying any official patches provided by Mattermost as per their advisory MMSA-2025-00528.

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