CVE-2025-14350
Information Disclosure via Improper Team Validation in Mattermost
Publication date: 2026-02-16
Last updated on: 2026-02-18
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 10.11.10 (exc) |
| mattermost | mattermost_server | From 11.2.0 (inc) to 11.2.2 (exc) |
| mattermost | mattermost_server | From 11.1.0 (inc) to 11.1.3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-862 | The product does not perform an authorization check when an actor attempts to access a resource or perform an action. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects certain versions of Mattermost (11.1.x up to 11.1.2, 10.11.x up to 10.11.9, and 11.2.x up to 11.2.1) where the software fails to properly validate team membership when processing channel mentions.
Because of this improper validation, authenticated users can determine whether specific teams exist and discover their URL names by posting channel shortlinks and observing the channel_mentions property in the API response.
How can this vulnerability impact me? :
The impact of this vulnerability is that authenticated users can gain information about the existence of teams and their URL names that they might not otherwise have access to.
This could potentially lead to information disclosure, allowing users to map out team structures or URLs, which might be used in further targeted attacks or reconnaissance.
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