CVE-2026-79746

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 66% 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
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 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 1.0.31, when a bearer key with accessType: 'servers' (or 'custom') is used against a group route, isBearerKeyAllowedForRequest grants access to the entire group as long as any single server in that group appears in the key's allowedServers list — not only when every server the key is scoped to matches, and critically, without ever re-checking allowedServers again once the group-level connection is authorized. A key explicitly scoped to one specific server therefore also grants full access to every other server that happens to share a group with it, including servers the key was never authorized for. This issue has been patched in version 1.0.31.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Aug 31, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v1.0.31

Patch available: samanhappy/mcphub v1.0.31

https://github.com/samanhappy/mcphub/releases/tag/v1.0.31
github_commit Patch Available

commit 2b10ae36112c (samanhappy/mcphub)

Patch available: samanhappy/mcphub v1.0.31 (contains commit 2b10ae36112c)

https://github.com/samanhappy/mcphub/commit/2b10ae36112ce68deebf910b22505d44efcef552
github_pr Patch Available

fix(security): require full containment for scoped bearer keys on group routes (GHSA-454m-4vm6-842f)

Patch available: samanhappy/mcphub v1.0.31 (PR #1059 merged 2026-08-21)

https://github.com/samanhappy/mcphub/pull/1059
github Patch Available🟡 PoC Available

Server-scoped bearer key gains access to an entire group via partial (any-overlap) server matching · Advisory · samanhappy/mcphub · GitHub

https://github.com/samanhappy/mcphub/security/advisories/GHSA-454m-4vm6-842f

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 44× 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 14:27 UTCEG score recompute
  2. 2026-09-24 14:04 UTCEPSS rescore
  3. 2026-09-24 01:48 UTCEG score recompute
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-23 00:58 UTCEG score recompute
  6. 2026-09-22 16:01 UTCEPSS rescore
  7. 2026-09-22 00:10 UTCEG score recompute
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-20 23:21 UTCEG score recompute
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-19 22:23 UTCEG score recompute
  12. 2026-09-18 21:34 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 05:15 UTCEPSS rescore
  18. 2026-09-15 03:47 UTCEG score recompute
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-14 02:55 UTCEG score recompute
  22. 2026-09-13 02:07 UTCEG score recompute
  23. 2026-09-12 01:19 UTCEG score recompute
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 19 more
  1. 2026-09-11 12:55 UTCEG score recompute
  2. 2026-09-10 12:07 UTCEG score recompute
  3. 2026-09-09 09:36 UTCEG score recompute
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 21:11 UTCEG score recompute
  6. 2026-09-06 20:21 UTCEG score recompute
  7. 2026-09-06 13:48 UTCEPSS rescore
  8. 2026-09-05 19:31 UTCEG score recompute
  9. 2026-09-04 18:43 UTCEG score recompute
  10. 2026-09-04 06:02 UTCEG score recompute
  11. 2026-09-04 05:07 UTCEPSS rescore
  12. 2026-09-02 16:44 UTCEG score recompute
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-01 15:43 UTCEG score recompute
  15. 2026-09-01 15:13 UTCEG score recompute
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-08-31 18:25 UTCEG score recompute
  18. 2026-08-31 18:02 UTCEG score recompute
  19. 2026-08-31 17:59 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-79746?
CVE-2026-79746 is a high 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 1.0.31, when a bearer key with accessType: 'servers' (or 'custom') is used against a group route,…
When was CVE-2026-79746 disclosed?
CVE-2026-79746 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-2026-79746 actively exploited?
CVE-2026-79746 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.8% of all scored CVEs.
What is the CVSS score of CVE-2026-79746?
CVE-2026-79746 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-79746?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79746, 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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