CVE-2026-4273

3.7 LOW

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...

Published: 2026-05-18 · Last updated: 2026-05-19

Severity and scoring

CVSS: 3.7 LOW
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE: CWE-863

Affected products

Vendor	Product
mattermost	mattermost_server

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

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-4273
[Vendor advisory]https://mattermost.com/security-updates

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