CVE-2026-28741
Received Received - Intake
CSRF Vulnerability in Mattermost Authentication Endpoint Allows Account Manipulation

Publication date: 2026-04-15

Last updated on: 2026-04-22

Assigner: Mattermost, Inc.

Description
Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625
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Meta Information
Published
2026-04-15
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-15
EPSS Evaluated
2026-06-15
NVD
CVE-2026-28741
EUVD
EUVD-2026-22875
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.13 (exc)
mattermost mattermost_server From 11.3.0 (inc) to 11.3.3 (exc)
mattermost mattermost_server From 11.4.0 (inc) to 11.4.3 (exc)
mattermost mattermost_server From 11.5.0 (inc) to 11.5.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
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Executive Summary

This vulnerability exists in certain versions of Mattermost where the application fails to validate CSRF (Cross-Site Request Forgery) tokens on an authentication endpoint.

Because of this failure, an attacker can trick a user into visiting a malicious webpage that performs unauthorized actions on the user's behalf, specifically updating the user's authentication method without their consent.

Impact Analysis

This vulnerability can lead to unauthorized changes to a user's authentication method, potentially allowing attackers to bypass security controls or gain unauthorized access.

Since the vulnerability has a CVSS base score of 6.8 with high impact on confidentiality and integrity, it can compromise sensitive user information and affect the trustworthiness of the authentication process.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Mattermost to a version later than the affected versions: versions greater than 10.11.12 for the 10.11.x branch, greater than 11.5.0 for the 11.5.x branch, greater than 11.4.2 for the 11.4.x branch, and greater than 11.3.2 for the 11.3.x branch.

Additionally, be cautious of phishing attempts that may trick users into visiting malicious pages that exploit the CSRF vulnerability.

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