CVE-2023-6727 Leak Inaccessible Playbook Information via Channel Action IDOR
Attackers can leak sensitive playbook information by exploiting missing authorization checks in channel action creation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-6727?
CVE-2023-6727 is a low-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 12 Dec 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to perform correct authorization checks when creating a playbook action, allowing users without access to the playbook to create playbook actions. If the playbook action created is to post a message in a channel based on specific keywords in a post, some playbook information, like the name, can be leaked.
Weakness: CWE-200
Which versions are affected by CVE-2023-6727?
1 open source package ship an affected version, including mattermost. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mattermost Bitnami | All versions | 8.1.6, 9.2.2 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2023-6727?
Upgrade mattermost to a fixed version for your release line: 8.1.6 or 9.2.2.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-6727 being exploited?
There is no known exploitation of CVE-2023-6727 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-2023-6727, GHSA-7g28-89m4-f55f.