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CVE-2026-107854— Jexactyl: Free-billing order endpoint renews and unsuspends arbitrary servers by ID (missing ownership check)

Quick assessment

Affected
Jexactyl Jexactyl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jexactyl 是一款可自定义的游戏管理面板和计费系统。在版本 4.0.0 至 4.0.5 中， 接口接受由客户端控制的 参数，并在加载服务器时未将查询限制在仅属于认证账户名下的服务器范围内。在启用了计费功能的安装实例中，经过身份验证的用户可以续期或解除对另一位租户的计费等服务器服务的暂停状态，前提是该服务器的续费日期（ ）不为空，且距离当前时间超过七天，即使用户与该服务器之间不存在子用户（subuser）关系。该问题已在 4.0.5 版本中得到修复。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-107854

Vulnerability Information
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Vulnerability Title
Jexactyl: Free-billing order endpoint renews and unsuspends arbitrary servers by ID (missing ownership check)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Jexactyl Jexactyl >= 4.0.0, < 4.0.5 -

II. Public POCs for CVE-2026-107854

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III. Intelligence Information for CVE-2026-107854

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Other References for CVE-2026-107854 (3)

IV. Related Vulnerabilities

Same product: Jexactyl
Same vendor: Jexactyl
Same weakness: CWE-639

V. Comments for CVE-2026-107854

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