What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-16
• Weakness: CWE-639

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.

Affected products

• Jexactyl: from 4.0.0, < 4.0.5

References

• https://github.com/Jexactyl/Jexactyl/commit/356a5b46a18d483ae90c862e130b1969e6df0777
• https://github.com/Jexactyl/Jexactyl/releases/tag/v4.0.5
• https://github.com/Jexactyl/Jexactyl/security/advisories/GHSA-9xwv-p7r5-5h5p

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