CVE-2026-73601

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 4, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Flowise before 3.1.3 Remote Code Execution via Custom MCP | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcp
github Patch Available🟡 PoC Available

Flowise RCE via Custom MCP Config Node · Advisory · FlowiseAI/Flowise · GitHub

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8

Vendor Advisories for CVE-2026-73601(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 26× in last 7d / 159× 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 217 total refreshes for this CVE.

  1. 2026-09-18 22:28 UTCEG score recompute
  2. 2026-09-18 22:28 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 11:29 UTCGHSA enrichment
  5. 2026-09-18 00:30 UTCEG score recompute
  6. 2026-09-18 00:30 UTCGHSA enrichment
  7. 2026-09-17 12:09 UTCGHSA enrichment
  8. 2026-09-17 00:13 UTCEG score recompute
  9. 2026-09-17 00:13 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 07:14 UTCEG score recompute
  12. 2026-09-16 07:14 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 20:13 UTCGHSA enrichment
  15. 2026-09-15 07:54 UTCEG score recompute
  16. 2026-09-15 07:54 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 20:54 UTCGHSA enrichment
  19. 2026-09-14 08:02 UTCGHSA enrichment
  20. 2026-09-13 21:02 UTCEG score recompute
  21. 2026-09-13 21:02 UTCGHSA enrichment
  22. 2026-09-13 10:03 UTCGHSA enrichment
  23. 2026-09-12 23:04 UTCEG score recompute
  24. 2026-09-12 23:04 UTCGHSA enrichment
  25. 2026-09-12 15:02 UTCEPSS rescore
Show 75 more
  1. 2026-09-12 11:48 UTCGHSA enrichment
  2. 2026-09-12 00:48 UTCEG score recompute
  3. 2026-09-12 00:48 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 13:48 UTCEG score recompute
  6. 2026-09-11 13:48 UTCGHSA enrichment
  7. 2026-09-11 02:48 UTCGHSA enrichment
  8. 2026-09-10 15:49 UTCEG score recompute
  9. 2026-09-10 15:49 UTCGHSA enrichment
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-10 04:48 UTCGHSA enrichment
  12. 2026-09-09 17:48 UTCGHSA enrichment
  13. 2026-09-09 05:07 UTCEG score recompute
  14. 2026-09-09 05:07 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 03:48 UTCGHSA enrichment
  17. 2026-09-07 16:47 UTCEG score recompute
  18. 2026-09-07 16:47 UTCGHSA enrichment
  19. 2026-09-07 05:48 UTCGHSA enrichment
  20. 2026-09-06 15:45 UTCEG score recompute
  21. 2026-09-06 15:45 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 04:45 UTCGHSA enrichment
  24. 2026-09-05 17:46 UTCEG score recompute
  25. 2026-09-05 17:46 UTCGHSA enrichment
  26. 2026-09-05 06:47 UTCEG score recompute
  27. 2026-09-05 06:47 UTCGHSA enrichment
  28. 2026-09-04 19:40 UTCEG score recompute▼ 0.20
  29. 2026-09-04 19:40 UTCGHSA enrichment
  30. 2026-09-04 19:39 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  31. 2026-09-04 16:43 UTCEG score recompute
  32. 2026-09-04 16:43 UTCGHSA enrichment
  33. 2026-09-04 12:16 UTCGHSA enrichment
  34. 2026-09-04 07:52 UTCEG score recompute
  35. 2026-09-04 07:52 UTCGHSA enrichment
  36. 2026-09-04 05:07 UTCEPSS rescore
  37. 2026-09-04 01:20 UTCGHSA enrichment
  38. 2026-09-03 20:40 UTCGHSA enrichment
  39. 2026-09-03 16:14 UTCGHSA enrichment
  40. 2026-09-03 08:22 UTCGHSA enrichment
  41. 2026-09-03 03:48 UTCGHSA enrichment
  42. 2026-09-02 23:24 UTCEG score recompute
  43. 2026-09-02 23:24 UTCGHSA enrichment
  44. 2026-09-02 14:12 UTCEPSS rescore
  45. 2026-09-02 06:16 UTCGHSA enrichment
  46. 2026-09-02 01:50 UTCGHSA enrichment
  47. 2026-09-01 20:46 UTCGHSA enrichment
  48. 2026-09-01 16:22 UTCEG score recompute
  49. 2026-09-01 16:22 UTCGHSA enrichment
  50. 2026-09-01 13:54 UTCEPSS rescore
  51. 2026-09-01 11:35 UTCGHSA enrichment
  52. 2026-09-01 06:18 UTCEG score recompute
  53. 2026-09-01 06:18 UTCGHSA enrichment
  54. 2026-09-01 04:40 UTCEPSS rescore
  55. 2026-09-01 04:40 UTCEPSS rescore
  56. 2026-09-01 00:58 UTCGHSA enrichment
  57. 2026-08-31 20:34 UTCGHSA enrichment
  58. 2026-08-31 12:35 UTCGHSA enrichment
  59. 2026-08-31 07:55 UTCGHSA enrichment
  60. 2026-08-31 03:32 UTCGHSA enrichment
  61. 2026-08-30 23:08 UTCEG score recompute
  62. 2026-08-30 23:08 UTCGHSA enrichment
  63. 2026-08-30 19:18 UTCEPSS rescore
  64. 2026-08-30 19:17 UTCEPSS rescore
  65. 2026-08-30 18:44 UTCGHSA enrichment
  66. 2026-08-30 14:19 UTCGHSA enrichment
  67. 2026-08-30 09:54 UTCGHSA enrichment
  68. 2026-08-30 05:23 UTCEG score recompute
  69. 2026-08-30 05:23 UTCGHSA enrichment
  70. 2026-08-30 01:22 UTCEPSS rescore
  71. 2026-08-30 00:55 UTCGHSA enrichment
  72. 2026-08-29 20:30 UTCGHSA enrichment
  73. 2026-08-29 15:09 UTCGHSA enrichment
  74. 2026-08-29 08:23 UTCEG score recompute
  75. 2026-08-29 08:23 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-73601?
CVE-2026-73601 is a high vulnerability published on August 13, 2026. Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOMMCPPROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and…
When was CVE-2026-73601 disclosed?
CVE-2026-73601 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73601 actively exploited?
CVE-2026-73601 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 42.4% of all scored CVEs.
What is the CVSS score of CVE-2026-73601?
CVE-2026-73601 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-73601?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73601, 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.

Dependency Blast Radius

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