Auth bypass in Jexactyl
CVE-2026-107854
Jexactyl is a customisable game management panel and billing system. From 4.0.0 until 4.0.5, the POST /api/client/billing/free/process endpoint accepts a client-controlled server_id and loads the server without restricting the lookup to servers owned by the authenticated account. On installations with billing enabled, an authenticated user can renew or unsuspend another tenant's billable server when its renewal_date is non-null and more than seven days away, even without a subuser relationship to that server. This issue is fixed in version 4.0.5.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Jexactyl — versions >= 4.0.0, < 4.0.5
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107854?
- CVE-2026-107854 is a medium-severity vulnerability in Jexactyl, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-09.
- How severe is CVE-2026-107854?
- Medium severity. CVSS v3 base score is 5.4 out of 10.