CVE-2024-11599: Domain Restriction Bypass on Registration

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-28 · updated 2026-06-17
Weakness: CWE-754

Description

Mattermost versions 10.0.x <= 10.0.1, 10.1.x <= 10.1.1, 9.11.x <= 9.11.3, 9.5.x <= 9.5.11 fail to properly validate email addresses which allows an unauthenticated user to bypass email domain restrictions via carefully crafted input on email registration.

Affected products

Mattermost: from 9.5.0 before 9.5.12; from 9.11.0 before 9.11.4; from 10.0.0 before 10.0.2; from 10.1.0 before 10.1.2 — fixed in 10.0.2, 10.1.2, 9.11.4, 9.5.12

How to fix

Upgrade to a fixed version: Mattermost 10.0.2, 10.1.2, 9.11.4, 9.5.12. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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