Auth bypass in Terminalfour
CVE-2025-58386
In Terminalfour 8 through 8.4.1.1, the userLevel parameter in the user management function is not subject to proper server-side authorization checks. A Power User can intercept and modify this parameter to assign the Administrator role to other existing lower-privileged accounts, or invite a new lower-privileged account and escalate its privileges. While manipulating this request, the Power User can also change the target account's password, effectively taking full control of it.
EPSS: 0.003 (22.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Terminalfour
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Product)
- cve@mitre.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-58386?
- CVE-2025-58386 is a critical-severity vulnerability in Terminalfour, classified under Improper Authorization. CVSS score: 9.8/10. Published 2025-12-02.
- How severe is CVE-2025-58386?
- Critical severity. CVSS v3 base score is 9.8 out of 10.