CVE-2025-12689
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-17

Last updated on: 2025-12-29

Assigner: Mattermost, Inc.

Description
Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.
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Meta Information
Published
2025-12-17
Last Modified
2025-12-29
Generated
2026-06-16
AI Q&A
2025-12-17
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12689
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.7 (exc)
mattermost mattermost_server From 10.12.0 (inc) to 10.12.3 (exc)
mattermost mattermost_server From 11.0.0 (inc) to 11.0.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1287 The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
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Executive Summary

This vulnerability exists in Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, and 10.11.x <= 10.11.6, where the software fails to check the WebSocket request field for proper UTF-8 format. This flaw allows an attacker to send a malformed WebSocket request that can crash the Calls plug-in.

Impact Analysis

The impact of this vulnerability is a denial of service condition where an attacker can crash the Calls plug-in by sending malformed WebSocket requests. This can disrupt communication features relying on the Calls plug-in, potentially affecting availability.

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