Mattermost Server up to 5.0 Access Restriction Command permission assignment

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CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

A vulnerability classified as critical was found in Mattermost Server up to 5.0. Affected by this vulnerability is some unknown processing of the component Access Restriction. The manipulation as part of a Command leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-732. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Mattermost Server before 5.1. It allows attackers to bypass intended access restrictions (for group-message channel creation) via the Group message slash command.

The weakness was released 06/19/2020 (Website). It is possible to read the advisory at mattermost.com. This vulnerability is known as CVE-2018-21256 since 06/19/2020. The exploitation appears to be easy. The attack can be launched remotely. Required for exploitation is a single authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.1 eliminates this vulnerability.

Entries connected to this vulnerability are available at 156956, 156957, 156958 and 156959.

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VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔒

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation (CWE-732)
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost Server 5.1

Timelineinfoedit

06/19/2020 Advisory disclosed
06/19/2020 +0 days CVE assigned
06/21/2020 +2 days VulDB entry created
10/26/2020 +127 days VulDB last update

Sourcesinfoedit

Advisory: mattermost.com
Status: Not defined
Confirmation: 🔒

CVE: CVE-2018-21256 (🔒)
See also: 🔒

Entryinfoedit

Created: 06/21/2020 09:21 AM
Updated: 10/26/2020 07:38 AM
Changes: (1) advisory_confirm_url
Complete: 🔍

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