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Mattermost fail to prompt for explicit approval before adding a team admin to a private channel

Low severity GitHub Reviewed Published Mar 21, 2025 to the GitHub Advisory Database • Updated Mar 21, 2025

Package

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

Affected versions

>= 9.11.0, < 9.11.9

Patched versions

9.11.9

Description

Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.

References

Published by the National Vulnerability Database Mar 21, 2025
Published to the GitHub Advisory Database Mar 21, 2025
Reviewed Mar 21, 2025
Last updated Mar 21, 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
High
User interaction
None
Scope
Unchanged
Confidentiality
Low
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:H/PR:H/UI:N/S:U/C:L/I:L/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.
(10th percentile)

Weaknesses

CVE ID

CVE-2025-27715

GHSA ID

GHSA-cw7q-5cgc-h3h9

Source code

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