CVE-2026-2461
Authorization Bypass in Mattermost Plugins Allows Comment Modification
Publication date: 2026-03-16
Last updated on: 2026-03-20
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 11.3.0 (inc) to 11.3.1 (exc) |
| mattermost | mattermost_server | to 10.11.11 (exc) |
| mattermost | mattermost_server | From 11.0.0 (inc) to 11.0.3 (inc) |
| mattermost | mattermost_server | From 11.1.0 (inc) to 11.2.3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-639 | The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects Mattermost Plugins versions up to 11.3, 11.0.3, 11.2.2, and 10.10.11.0. It occurs because these versions fail to implement proper authorization checks when modifying comment blocks. As a result, an authorized attacker who has editor permissions can modify comments created by other board members without proper restrictions.
How can this vulnerability impact me? :
The vulnerability allows an attacker with editor permissions to alter comments made by other users. This can lead to unauthorized changes in communication or documentation within the Mattermost platform, potentially causing misinformation, confusion, or manipulation of collaborative content.
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