CVE-2023-3613 Guest accounts invited and added to channels by Welcomebot plugin
The Mattermost WelcomeBot plugin allows guest accounts to be added to channels without proper validation, potentially exposing channel data to unauthorized users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-3613?
CVE-2023-3613 is a low-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 17 Jul 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Mattermost WelcomeBot plugin fails to to validate the membership status when inviting or adding users to channels allowing guest accounts to be added or invited to channels by default.
Weakness: CWE-863
Which versions are affected by CVE-2023-3613?
1 open source package ship an affected version, including mattermost. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mattermost Bitnami | All versions | 7.8.6, 7.10.3 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2023-3613?
Upgrade mattermost to a fixed version for your release line: 7.8.6 or 7.10.3.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-3613 being exploited?
There is no known exploitation of CVE-2023-3613 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as BIT-mattermost-2023-3613, GHSA-v326-937j-3p86.