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Mattermost doesn't set permissions on downloaded bulk export

Moderate severity GitHub Reviewed Published Mar 26, 2026 to the GitHub Advisory Database • Updated Mar 31, 2026

Package

gomod github.com/mattermost/mattermost-server (Go)

Affected versions

>= 11.4.0-rc1, < 11.4.1
>= 11.3.0-rc1, < 11.3.2
>= 11.2.0-rc1, < 11.2.4
>= 10.11.0-rc1, < 10.11.12
>= 8.0.0-20260105080200-d27a2195068d, < 8.0.0-20260217110922-b7d4a1f1f59b

Patched versions

11.4.1
11.3.2
11.2.4
10.11.12
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 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.

References

Published by the National Vulnerability Database Mar 26, 2026
Published to the GitHub Advisory Database Mar 26, 2026
Reviewed Mar 31, 2026
Last updated Mar 31, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(0th percentile)

Weaknesses

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. Learn more on MITRE.

CVE ID

CVE-2026-3113

GHSA ID

GHSA-4765-v66x-rqx7

Source code

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