CVE-2025-27715: Auto-Enrollment of Team Admins into Private Channels without explicit consent
First published: Fri Mar 21 2025(Updated: )
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.
Credit: responsibledisclosure@mattermost.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mattermost | <=9.11.8 | |
| go/github.com/mattermost/mattermost/server/v8 | >=9.11.0<9.11.9 | 9.11.9 |
| Mattermost | >=9.11.0<9.11.9 |
Remedy
Update Mattermost to versions 10.5.0, 9.11.9 or higher.
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-27715?
CVE-2025-27715 is considered a medium-severity vulnerability due to its potential for unauthorized access to private channels.
How do I fix CVE-2025-27715?
To fix CVE-2025-27715, upgrade Mattermost to version 9.11.9 or later where the vulnerability has been addressed.
What are the potential risks of CVE-2025-27715?
The potential risks of CVE-2025-27715 include unauthorized additions of team admins to private channels without consent.
Which versions of Mattermost are affected by CVE-2025-27715?
Mattermost versions 9.11.x up to and including 9.11.8 are affected by CVE-2025-27715.
Can an attacker exploit CVE-2025-27715 remotely?
Yes, an attacker can exploit CVE-2025-27715 remotely by using crafted permalink links to gain access to private channels.
- agent/weakness
- agent/title
- agent/remedy
- agent/type
- agent/description
- agent/first-publish-date
- agent/guess-ai
- agent/software-canonical-lookup
- agent/author
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-cw7q-5cgc-h3h9
- alias/CVE-2025-27715
- agent/references
- agent/source
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/last-modified-date
- collector/nvd-api
- source/NVD
- agent/tags
- agent/softwarecombine
- collector/nvd-cve
- agent/event
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/github-advisory
- vendor/mattermost
- canonical/mattermost
- package-manager/go
- version/mattermost/9.11.0