CVE-2025-58075

Arbitrary Mattermost Team can be joined by manipulating the SAML RelayState

State: Published
Severity: 8.1 High
Published: Oct 16, 2025
Updated: Feb 26, 2026
Reserved: Sep 16, 2025

Description

Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the RelayState

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	Mattermost

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
MattermostMattermost	10.11.0 through 10.11.1Affected 10.10.0 through 10.10.2Affected 10.5.0 through 10.5.10Affected 10.12.0Not affected 10.11.2Not affected 10.10.3Not affected 10.5.11Not affected

References

https://mattermost.com/security-updates

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