CVE-2026-2461
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Authorization Bypass in Mattermost Plugins Allows Comment Modification

Publication date: 2026-03-16

Last updated on: 2026-03-20

Assigner: Mattermost, Inc.

Description
Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559
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Meta Information
Published
2026-03-16
Last Modified
2026-03-20
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-15
NVD
CVE-2026-2461
EUVD
EUVD-2026-12411
Affected Vendors & Products
Showing 4 associated CPEs
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
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

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