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TI-2026-70289 Aliases CVE-2026-107854

Jexactyl billing endpoint lets users renew or unsuspend other servers

Priority LOW 24CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

Jexactyl, a customisable game management panel and billing system, from 4.0.0 before 4.0.5 has a missing ownership check (CWE-639) in its free-billing order endpoint. The endpoint loads a server chosen by a client-supplied server_id without checking that the authenticated account owns it. On installations with billing enabled, an authenticated user can renew or unsuspend another tenant's billable server when its renewal date is set and more than seven days away.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00211 11th percentileScored 2026-11-07
Fix Fixed Jexactyl (Jexactyl): 4.0.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JexactylJexactyl4.0.0 to before 4.0.54.0.5Patch availableCNA
  • Jexactyl VendorJexactyl Affected 4.0.0 to before 4.0.5 Fixed in 4.0.5 Patch available CNA

Remediation

Upgrade Jexactyl to version 4.0.5, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA Jexactyl (Jexactyl) Fixed in 4.0.5

Timeline

  1. 2026-10-10 Threatist record created from CVE-2026-107854
  2. 2026-10-11 Priority changed: MEDIUM → LOW
  3. 2026-10-13 CISA SSVC decision points changed

References

Other 3

  • TI-2026-70288 Stripe checkout confirmation in Jexactyl accepts mismatched payments CVSS 4.0HIGH 7.1
  • TI-2026-25503 Jexactyl has Stored DOM Cross-Site Scripting (XSS) via unescaped JSON in Blade template CVSS 3.1MEDIUM 5.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences