Mattermost 11.4.0 Bulk Export LFR Local Users Read Exported Data
CVE-2026-3113 Published on March 26, 2026
mmctl export download command doesn’t restrict permissions to created file to file owner
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 set permissions on downloaded bulk export which allows other local users on the server to be able to read contents of the bulk export.. Mattermost Advisory ID: MMSA-2026-00593
Vulnerability Analysis
CVE-2026-3113 can be exploited with local system access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
Incorrect Permission Assignment for Critical Resource
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. When a resource is given a permissions setting that provides access to a wider range of actors than required, it could lead to the exposure of sensitive information, or the modification of that resource by unintended parties. This is especially dangerous when the resource is related to program configuration, execution or sensitive user data.
Products Associated with CVE-2026-3113
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Affected Versions
Mattermost:- Version 11.4.0, <= 11.4.0 is affected.
- Version 11.3.0, <= 11.3.1 is affected.
- Version 11.2.0, <= 11.2.3 is affected.
- Version 10.11.0, <= 10.11.11 is affected.
- Version 11.5.0 is unaffected.
- Version 11.4.1 is unaffected.
- Version 11.3.2 is unaffected.
- Version 11.2.4 is unaffected.
- Version 10.11.12 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.