CVE-2026-77073

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2026-08-20. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references on workflows in different projects.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
Patch available. Sources: github.
generic

n8n before 2.34.1 Cross-Project Credential Access via MCP | Advisories | VulnCheck

https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp
github Patch Available

MCP create_workflow_from_code Accepts Cross-Project Credentials When Auth Type Is an Expression · Advisory · n8n-io/n8n · GitHub

https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp

Vendor Advisories for CVE-2026-77073(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 18× in last 7d / 86× 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. 2026-09-21 00:27 UTCEG score recompute
  2. 2026-09-21 00:27 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 00:35 UTCEG score recompute
  5. 2026-09-20 00:35 UTCGHSA enrichment
  6. 2026-09-19 00:44 UTCEG score recompute
  7. 2026-09-19 00:44 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 00:52 UTCEG score recompute
  10. 2026-09-18 00:52 UTCGHSA enrichment
  11. 2026-09-17 01:00 UTCEG score recompute
  12. 2026-09-17 01:00 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-16 01:08 UTCEG score recompute
  16. 2026-09-16 01:08 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 01:16 UTCGHSA enrichment
  19. 2026-09-14 01:24 UTCEG score recompute
  20. 2026-09-14 01:24 UTCGHSA enrichment
  21. 2026-09-13 01:33 UTCEG score recompute
  22. 2026-09-13 01:33 UTCGHSA enrichment
  23. 2026-09-12 15:02 UTCEPSS rescore
  24. 2026-09-12 01:41 UTCEG score recompute
  25. 2026-09-12 01:41 UTCGHSA enrichment
Show 69 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 01:49 UTCEG score recompute
  3. 2026-09-11 01:49 UTCGHSA enrichment
  4. 2026-09-10 09:35 UTCEPSS rescore
  5. 2026-09-10 01:57 UTCGHSA enrichment
  6. 2026-09-09 02:06 UTCEG score recompute
  7. 2026-09-09 02:06 UTCGHSA enrichment
  8. 2026-09-08 22:01 UTCEPSS rescore
  9. 2026-09-07 20:46 UTCEG score recompute
  10. 2026-09-07 20:46 UTCGHSA enrichment
  11. 2026-09-06 20:55 UTCEG score recompute
  12. 2026-09-06 20:55 UTCGHSA enrichment
  13. 2026-09-06 13:48 UTCEPSS rescore
  14. 2026-09-05 21:03 UTCEG score recompute
  15. 2026-09-05 21:03 UTCGHSA enrichment
  16. 2026-09-04 21:12 UTCEG score recompute
  17. 2026-09-04 21:12 UTCGHSA enrichment
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-03 21:05 UTCGHSA enrichment
  20. 2026-09-02 21:12 UTCEG score recompute
  21. 2026-09-02 21:12 UTCGHSA enrichment
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 19:35 UTCEG score recompute▼ 1.00
  24. 2026-09-01 19:35 UTCGHSA enrichment
  25. 2026-09-01 19:25 UTCNVD updateCVSS v3 → 4.3
  26. 2026-09-01 13:54 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-09-01 04:40 UTCEPSS rescore
  29. 2026-08-31 20:41 UTCGHSA enrichment
  30. 2026-08-31 14:47 UTCEG score recompute
  31. 2026-08-31 14:47 UTCGHSA enrichment
  32. 2026-08-30 19:18 UTCEPSS rescore
  33. 2026-08-30 19:17 UTCEPSS rescore
  34. 2026-08-30 14:49 UTCEG score recompute
  35. 2026-08-30 14:48 UTCGHSA enrichment
  36. 2026-08-30 01:22 UTCEPSS rescore
  37. 2026-08-29 14:56 UTCEG score recompute
  38. 2026-08-29 14:55 UTCGHSA enrichment
  39. 2026-08-28 21:42 UTCEPSS rescore
  40. 2026-08-28 15:04 UTCGHSA enrichment
  41. 2026-08-27 15:07 UTCEG score recompute
  42. 2026-08-27 15:07 UTCGHSA enrichment
  43. 2026-08-27 14:25 UTCEPSS rescore
  44. 2026-08-26 15:15 UTCEG score recompute
  45. 2026-08-26 15:15 UTCGHSA enrichment
  46. 2026-08-26 14:47 UTCEPSS rescore
  47. 2026-08-25 15:23 UTCEG score recompute
  48. 2026-08-25 15:23 UTCGHSA enrichment
  49. 2026-08-25 14:35 UTCEG score recompute
  50. 2026-08-25 14:35 UTCGHSA enrichment
  51. 2026-08-25 13:49 UTCEPSS rescore
  52. 2026-08-25 11:48 UTCEG score recompute
  53. 2026-08-25 11:48 UTCGHSA enrichment
  54. 2026-08-24 14:18 UTCEPSS rescore
  55. 2026-08-24 11:54 UTCEG score recompute
  56. 2026-08-24 11:54 UTCGHSA enrichment
  57. 2026-08-23 12:02 UTCEG score recompute
  58. 2026-08-23 12:02 UTCGHSA enrichment
  59. 2026-08-23 00:19 UTCEPSS rescore
  60. 2026-08-22 12:11 UTCEG score recompute
  61. 2026-08-22 12:11 UTCGHSA enrichment
  62. 2026-08-21 23:49 UTCEPSS rescore
  63. 2026-08-21 12:19 UTCEG score recompute
  64. 2026-08-21 12:19 UTCGHSA enrichment
  65. 2026-08-21 11:30 UTCEG score recompute
  66. 2026-08-21 11:30 UTCGHSA enrichment
  67. 2026-08-20 12:20 UTCEG score recompute
  68. 2026-08-20 11:37 UTCEG score recompute
  69. 2026-08-20 11:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77073?
CVE-2026-77073 is a medium vulnerability published on August 20, 2026. n8n versions before 2.34.1 contain a credential validation bypass in the MCP createworkflowfrom_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references…
When was CVE-2026-77073 disclosed?
CVE-2026-77073 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77073 actively exploited?
CVE-2026-77073 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 89.7% of all scored CVEs.
What is the CVSS score of CVE-2026-77073?
CVE-2026-77073 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-77073?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77073, 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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