VULNERABILITY INTELLIGENCE

CVE-2026-4273

CVSS score3.7 LOW
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-05-18
Last modified2026-10-14
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references