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: 1.1%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.1%
EPSS %ILE
64th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 17× in last 7d / 95× 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 262 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 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 1.1% probability of exploitation in the next 30 days (64th percentile of EPSS-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?
A fix for CVE-2026-73601 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73601 are linked in the Vendor Advisories panel on this page.

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