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CVE-2025-6227

Good to know:

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Date: July 18, 2025

Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.

Severity Score

Related Resources (6)

https://github.com/mattermost/mattermost
https://github.com/advisories/GHSA-4fwj-8595-wp25
https://mattermost.com/security-updates
https://nvd.nist.gov/vuln/detail/CVE-2025-6227
https://github.com/mattermost/mattermost/commit/fbf105f6ef8f6cd5a89f859f09a2d1216cd81c05
https://www.mend.io/vulnerability-database/CVE-2025-6227

Severity Score

Weakness Type (CWE)

Insufficiently Protected Credentials

CWE-522

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost - v9.11.17;github.com/mattermost/mattermost - v10.5.8;github.com/mattermost/mattermost-server - v10.5.8;github.com/mattermost/mattermost-server - v9.11.17;github.com/mattermost/mattermost-server - v9.11.17+incompatible;github.com/mattermost/mattermost/server/v8 - v8.0.0-20250612074655-8f8612c63783

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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