What’s Vulnerable › Vulnerabilities
CVE-2023-4478: Parameter tampering in the registration resulting in blocked accounts to be created
- Severity: high (CVSS 8.2 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: 2023-08-25 · updated 2026-06-17
- Weakness: CWE-74
Description
Mattermost fails to restrict which parameters' values it takes from the request during signup allowing an attacker to register users as inactive, thus blocking them from later accessing Mattermost without the system admin activating their accounts.
Affected products
- Mattermost: before 7.8.9; from 7.9.0 before 7.10.5; 8.0.0 — fixed in 7.10.5, 7.8.9
How to fix
Upgrade to a fixed version: Mattermost 7.10.5, 7.8.9. Check the vendor advisory for mitigations.
References
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