CVE-2026-79748

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. 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
Elevated
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.9Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 0.12.15, the POST /api/servers and PUT /api/servers/:name endpoints in MCPHub create/update MCP server configurations and then immediately spawn the configured stdio process via child_process.spawn. Authentication is required, but there is no authorization check restricting these endpoints to admins, and there is no allowlist/sanitization on the command and args fields. As a result, any authenticated non-admin user can submit a server configuration with command:"/bin/sh" (or any other binary) and arbitrary args, causing MCPHub to execute the attacker-controlled process as the MCPHub server's OS user (commonly root in the published Docker image and in npx/systemd deployments). This issue has been patched in version 0.12.15.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
61(Track*)
EG Risk 61/100SSVC: Track*

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 computed
Severity99% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Sep 22, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github.
github Patch Available🟡 PoC Available

Authenticated non-admin user achieves RCE via POST /api/servers (missing authorization on stdio command/args) · Advisory · samanhappy/mcphub · GitHub

https://github.com/samanhappy/mcphub/security/advisories/GHSA-mx89-jjx9-gjr8
github_release Patch Available

v0.12.15

Patch available: samanhappy/mcphub v0.12.15

https://github.com/samanhappy/mcphub/releases/tag/v0.12.15
github_pr Patch Available

fix: harden auth and ownership checks

Patch available: samanhappy/mcphub v1.0.10 (PR #770 merged 2026-04-28)

https://github.com/samanhappy/mcphub/pull/770

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 47× 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.

  1. 2026-09-24 18:39 UTCEG score recompute
  2. 2026-09-24 14:04 UTCEPSS rescore
  3. 2026-09-23 19:59 UTCEG score recompute
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-22 18:11 UTCEG score recompute
  6. 2026-09-22 16:01 UTCEPSS rescore
  7. 2026-09-21 23:52 UTCEG score recompute
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-20 22:08 UTCEG score recompute
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-19 16:01 UTCEG score recompute
  12. 2026-09-18 22:35 UTCEG score recompute
  13. 2026-09-18 19:28 UTCEPSS rescore
  14. 2026-09-17 20:47 UTCEG score recompute
  15. 2026-09-16 18:44 UTCEG score recompute
  16. 2026-09-16 14:08 UTCEPSS rescore
  17. 2026-09-16 09:08 UTCEG score recompute
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 05:36 UTCEG score recompute
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-13 18:21 UTCEG score recompute
  23. 2026-09-12 16:36 UTCEG score recompute
  24. 2026-09-11 19:10 UTCEG score recompute
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 22 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 10:16 UTCEG score recompute
  3. 2026-09-10 12:47 UTCEG score recompute
  4. 2026-09-09 01:29 UTCEG score recompute
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-07 19:14 UTCEG score recompute
  7. 2026-09-06 14:50 UTCEG score recompute
  8. 2026-09-06 13:48 UTCEPSS rescore
  9. 2026-09-05 17:21 UTCEG score recompute
  10. 2026-09-04 15:27 UTCEG score recompute
  11. 2026-09-04 06:50 UTCEG score recompute
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-02 14:37 UTCEG score recompute
  14. 2026-09-02 14:12 UTCEPSS rescore
  15. 2026-09-01 17:05 UTCEG score recompute
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-08-31 23:45 UTCEG score recompute
  18. 2026-08-31 19:28 UTCEG score recompute
  19. 2026-08-31 18:49 UTCEG score recompute
  20. 2026-08-31 18:25 UTCEG score recompute
  21. 2026-08-31 18:02 UTCEG score recompute
  22. 2026-08-31 17:59 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-79748?
CVE-2026-79748 is a critical vulnerability published on August 31, 2026. MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 0.12.15, the POST /api/servers and PUT /api/servers/:name endpoints in MCPHub create/update MCP server configurations and…
When was CVE-2026-79748 disclosed?
CVE-2026-79748 was first published in the National Vulnerability Database on August 31, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79748 actively exploited?
CVE-2026-79748 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.8% of all scored CVEs.
What is the CVSS score of CVE-2026-79748?
CVE-2026-79748 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-79748?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79748, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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