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Mattermost fails to properly enforce access controls for guest users

Low severity GitHub Reviewed Published May 30, 2025 to the GitHub Advisory Database • Updated May 30, 2025

Package

gomod github.com/mattermost/mattermost/server/v8 (Go)

Affected versions

>= 10.6.0-rc1, < 10.7.1
>= 10.0.0-rc1, < 10.5.4
>= 9.0.0-rc1, < 9.11.13
< 8.0.0-20250414110750-c23f44fe8ed0

Patched versions

10.7.1
10.5.4
9.11.13
8.0.0-20250414110750-c23f44fe8ed0

Description

Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fail to properly enforce access controls for guest users accessing channel member information, allowing authenticated guest users to view metadata about members of public channels via the channel members API endpoint.

References

Published by the National Vulnerability Database May 30, 2025
Published to the GitHub Advisory Database May 30, 2025
Reviewed May 30, 2025
Last updated May 30, 2025

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
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
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:N/AC:H/PR:L/UI:N/S:U/C:L/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.
(5th percentile)

Weaknesses

CVE ID

CVE-2025-1792

GHSA ID

GHSA-hc6v-386m-93pq

Source code

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