Security Advisory

CVE-2026-4273

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-18 06:56:11

Last updated 2026-05-18 14:34:29

Assigner Mattermost

CVSS score 3.7

State PUBLISHED

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575

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