CVE-2026-24692
Improper Access Control in Mattermost Search API Allows Data Exposure
Publication date: 2026-03-16
Last updated on: 2026-03-18
Assigner: Mattermost, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mattermost | mattermost_server | From 10.11.0 (inc) to 10.11.11 (exc) |
| mattermost | mattermost_server | From 11.2.0 (inc) to 11.2.3 (exc) |
| mattermost | mattermost_server | From 11.3.0 (inc) to 11.3.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-863 | The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects certain versions of Mattermost (11.3.x <= 11.3.0, 11.2.x <= 11.2.2, and 10.11.x <= 10.11.10) where the system fails to properly enforce read permissions in its search API endpoints.
As a result, guest users who do not have read permissions can still access posts and files in channels by making search API requests.
How can this vulnerability impact me? :
The vulnerability allows unauthorized guest users to access posts and files in channels that they should not be able to read.
This can lead to unintended disclosure of sensitive or confidential information.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know