CVE-2026-81094

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. the CNA's CVSS baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

The mcp-router CLI served its MCP aggregator on every interface and enforced authentication only when the operator asked for it. The serve command in apps/cli/src/commands/serve.ts defaulted its host to the all-interfaces address on a fixed port, and required a token only when the corresponding flag was supplied, so a default invocation exposed the aggregator, and every MCP server it fronted, to anyone able to reach the port. Release 0.6.3 defaults the host to the loopback address and refuses to start without a token whenever the host it is given is not a loopback address; no earlier release carries either check.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 29, 2026

Advisory Details (4)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit.
generic

mcp-router CLI before 0.6.3 Binds the MCP Aggregator to All Interfaces Without Requiring Authentication | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mcp-router-cli-before-0.6.3-binds-the-mcp-aggregator-to-all-interfaces-without-requiring-authentication
generic

mcp-router/apps/cli/src/commands/serve.ts at v0.6.3 · mcp-router/mcp-router · GitHub

https://github.com/mcp-router/mcp-router/blob/v0.6.3/apps/cli/src/commands/serve.ts#L105
github_commit Patch Available

commit 4c4642cfd274 (mcp-router/mcp-router)

Patch available: mcp-router/mcp-router v0.6.3 (contains commit 4c4642cfd274)

https://github.com/mcp-router/mcp-router/commit/4c4642cfd274097ec8b33ecd3047390829c79d35
generic

GitHub - mcp-router/mcp-router: A Unified MCP Server Management App (MCP Manager). · GitHub

https://github.com/mcp-router/mcp-router

Vendor Advisories for CVE-2026-81094(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 50× in last 7d / 183× 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.

Showing the most recent 100 of 183 total refreshes for this CVE.

  1. 2026-09-21 06:47 UTCGHSA enrichment
  2. 2026-09-21 02:30 UTCGHSA enrichment
  3. 2026-09-20 22:12 UTCEG score recompute
  4. 2026-09-20 22:12 UTCGHSA enrichment
  5. 2026-09-20 20:16 UTCEPSS rescore
  6. 2026-09-20 17:55 UTCGHSA enrichment
  7. 2026-09-20 13:36 UTCGHSA enrichment
  8. 2026-09-20 09:20 UTCGHSA enrichment
  9. 2026-09-20 04:57 UTCGHSA enrichment
  10. 2026-09-20 00:38 UTCGHSA enrichment
  11. 2026-09-19 20:21 UTCGHSA enrichment
  12. 2026-09-19 16:04 UTCEG score recompute
  13. 2026-09-19 16:04 UTCGHSA enrichment
  14. 2026-09-19 11:48 UTCGHSA enrichment
  15. 2026-09-19 07:30 UTCGHSA enrichment
  16. 2026-09-19 03:13 UTCGHSA enrichment
  17. 2026-09-18 22:56 UTCEG score recompute
  18. 2026-09-18 22:56 UTCGHSA enrichment
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-18 18:40 UTCGHSA enrichment
  21. 2026-09-18 14:23 UTCGHSA enrichment
  22. 2026-09-18 09:46 UTCGHSA enrichment
  23. 2026-09-18 05:29 UTCGHSA enrichment
  24. 2026-09-18 01:12 UTCGHSA enrichment
  25. 2026-09-17 20:55 UTCEG score recompute
Show 75 more
  1. 2026-09-17 20:55 UTCGHSA enrichment
  2. 2026-09-17 12:13 UTCGHSA enrichment
  3. 2026-09-17 07:55 UTCGHSA enrichment
  4. 2026-09-17 03:38 UTCGHSA enrichment
  5. 2026-09-16 23:21 UTCGHSA enrichment
  6. 2026-09-16 19:04 UTCEG score recompute
  7. 2026-09-16 19:04 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 14:08 UTCGHSA enrichment
  10. 2026-09-16 09:15 UTCEG score recompute
  11. 2026-09-16 09:15 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 03:48 UTCGHSA enrichment
  14. 2026-09-15 23:31 UTCGHSA enrichment
  15. 2026-09-15 18:29 UTCGHSA enrichment
  16. 2026-09-15 14:11 UTCGHSA enrichment
  17. 2026-09-15 09:54 UTCGHSA enrichment
  18. 2026-09-15 05:37 UTCEG score recompute
  19. 2026-09-15 05:37 UTCGHSA enrichment
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-15 00:34 UTCGHSA enrichment
  23. 2026-09-14 20:17 UTCGHSA enrichment
  24. 2026-09-14 16:00 UTCGHSA enrichment
  25. 2026-09-14 11:43 UTCGHSA enrichment
  26. 2026-09-14 07:26 UTCGHSA enrichment
  27. 2026-09-14 03:09 UTCGHSA enrichment
  28. 2026-09-13 22:53 UTCGHSA enrichment
  29. 2026-09-13 18:36 UTCEG score recompute
  30. 2026-09-13 18:36 UTCGHSA enrichment
  31. 2026-09-13 14:19 UTCGHSA enrichment
  32. 2026-09-13 10:02 UTCGHSA enrichment
  33. 2026-09-13 05:45 UTCGHSA enrichment
  34. 2026-09-13 01:28 UTCGHSA enrichment
  35. 2026-09-12 21:11 UTCGHSA enrichment
  36. 2026-09-12 16:54 UTCEG score recompute
  37. 2026-09-12 16:54 UTCGHSA enrichment
  38. 2026-09-12 12:37 UTCGHSA enrichment
  39. 2026-09-12 08:20 UTCGHSA enrichment
  40. 2026-09-12 04:03 UTCGHSA enrichment
  41. 2026-09-11 23:46 UTCGHSA enrichment
  42. 2026-09-11 19:29 UTCGHSA enrichment
  43. 2026-09-11 15:10 UTCEG score recompute
  44. 2026-09-11 15:10 UTCGHSA enrichment
  45. 2026-09-11 14:53 UTCEPSS rescore
  46. 2026-09-11 14:53 UTCEPSS rescore
  47. 2026-09-11 10:53 UTCEG score recompute
  48. 2026-09-11 10:53 UTCGHSA enrichment
  49. 2026-09-11 05:59 UTCGHSA enrichment
  50. 2026-09-11 01:42 UTCGHSA enrichment
  51. 2026-09-10 21:25 UTCGHSA enrichment
  52. 2026-09-10 17:08 UTCGHSA enrichment
  53. 2026-09-10 12:51 UTCEG score recompute
  54. 2026-09-10 12:51 UTCGHSA enrichment
  55. 2026-09-10 08:34 UTCGHSA enrichment
  56. 2026-09-10 04:17 UTCGHSA enrichment
  57. 2026-09-10 00:00 UTCGHSA enrichment
  58. 2026-09-09 18:06 UTCGHSA enrichment
  59. 2026-09-09 13:49 UTCGHSA enrichment
  60. 2026-09-09 09:14 UTCGHSA enrichment
  61. 2026-09-09 04:57 UTCGHSA enrichment
  62. 2026-09-09 00:41 UTCEG score recompute
  63. 2026-09-09 00:41 UTCGHSA enrichment
  64. 2026-09-08 22:01 UTCEPSS rescore
  65. 2026-09-08 13:18 UTCGHSA enrichment
  66. 2026-09-08 08:14 UTCGHSA enrichment
  67. 2026-09-08 03:58 UTCGHSA enrichment
  68. 2026-09-07 23:40 UTCGHSA enrichment
  69. 2026-09-07 19:23 UTCEG score recompute
  70. 2026-09-07 19:23 UTCGHSA enrichment
  71. 2026-09-07 15:06 UTCGHSA enrichment
  72. 2026-09-07 09:28 UTCGHSA enrichment
  73. 2026-09-07 05:05 UTCGHSA enrichment
  74. 2026-09-07 00:45 UTCGHSA enrichment
  75. 2026-09-06 20:29 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81094?
CVE-2026-81094 is a critical vulnerability published on August 27, 2026. The mcp-router CLI served its MCP aggregator on every interface and enforced authentication only when the operator asked for it. The serve command in apps/cli/src/commands/serve.ts defaulted its host to the all-interfaces address on a fixed port, and required a token only when the corresponding…
When was CVE-2026-81094 disclosed?
CVE-2026-81094 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81094 actively exploited?
CVE-2026-81094 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 63.8% of all scored CVEs.
What is the CVSS score of CVE-2026-81094?
CVE-2026-81094 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-81094?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81094, 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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