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.
CVE-2026-107854
MEDIUMPre-NVD 5.45.4—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (10th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 5.4
- EG Score
- 5.4MEDIUMmedium confidence
- EG Risk
- 29EG Risk 29/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity54% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.2%
- EPSS %ILE
- 10th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
October 9, 2026
Last Modified
October 9, 2026
Advisory Details (3)
Auto-updated Oct 9, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available
v4.0.5
Patch available: Jexactyl/Jexactyl v4.0.5
https://github.com/Jexactyl/Jexactyl/releases/tag/v4.0.5github_commit Patch Available
commit 356a5b46a18d (Jexactyl/Jexactyl)
Patch available: Jexactyl/Jexactyl v4.0.5 (contains commit 356a5b46a18d)
https://github.com/Jexactyl/Jexactyl/commit/356a5b46a18d483ae90c862e130b1969e6df0777githubMentions a patch (unverified)🟡 PoC Available
Free-billing order endpoint renews and unsuspends arbitrary servers by ID (missing ownership check) · Advisory · Jexactyl/Jexactyl · GitHub
https://github.com/Jexactyl/Jexactyl/security/advisories/GHSA-9xwv-p7r5-5h5pWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-10 20:17 UTCEG score recompute
- 2026-10-10 19:59 UTCEPSS rescore
- 2026-10-09 21:20 UTCEG score recompute
- 2026-10-09 20:40 UTCEG score recompute
- 2026-10-09 20:40 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-107854?
CVE-2026-107854 is a medium vulnerability published on October 9, 2026. 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 serverid and loads the server without restricting the lookup to servers owned by the authenticated account. On installations…
When was CVE-2026-107854 disclosed?
CVE-2026-107854 was first published on October 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-107854 actively exploited?
CVE-2026-107854 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107854?
CVE-2026-107854 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107854?
A fix for CVE-2026-107854 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-107854
Is Your Infrastructure Affected by CVE-2026-107854?
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