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Mattermost allows team admins to promote guests to team admins

Low severity GitHub Reviewed Published Apr 26, 2024 to the GitHub Advisory Database • Updated Apr 26, 2024

Package

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

Affected versions

>= 9.5.0, <= 9.5.2
>= 8.1.0, <= 8.1.11

Patched versions

9.5.3
8.1.12

Description

Mattermost versions 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 fail to fully validate role changes, which allows an attacker authenticated as a team admin to promote guests to team admins via crafted HTTP requests.

References

Published by the National Vulnerability Database Apr 26, 2024
Published to the GitHub Advisory Database Apr 26, 2024
Reviewed Apr 26, 2024
Last updated Apr 26, 2024

Severity

Low

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
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
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:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

EPSS score

0.043%
(10th percentile)

Weaknesses

CVE ID

CVE-2024-4195

GHSA ID

GHSA-5fh7-7mw7-mmx5

Source code

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