BaseFortify

Publication date: 2025-12-17

Last updated on: 2025-12-29

Assigner: Mattermost, Inc.

Description

Mattermost versions 10.11.x <= 10.11.5, 11.0.x <= 11.0.4, 10.12.x <= 10.12.2 fail to invalidate remote cluster invite tokens when using the legacy (version 1) protocol or when the confirming party does not provide a refreshed token, which allows an attacker who has obtained an invite token to authenticate as the remote cluster and perform limited actions on shared channels even after the invitation has been legitimately confirmed.

CVSS Scores

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Meta Information

Published

2025-12-17

Last Modified

2025-12-29

Generated

2026-07-06

AI Q&A

2025-12-17

EPSS Evaluated

2026-07-04

NVD

CVE-2025-13324

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	From 10.11.0 (inc) to 10.11.6 (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

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability exists in certain versions of Mattermost where invite tokens are not invalidated after being used. This flaw allows attackers who have intercepted these invite tokens to reuse them (token replay attack) to manipulate channel memberships, such as adding or removing users from private channels.

Impact Analysis

The vulnerability can impact you by allowing unauthorized manipulation of private channel memberships. Malicious actors could add or remove users from private channels without permission, potentially leading to unauthorized access to sensitive communications or exclusion of legitimate users.

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