CVE-2026-56274

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: HIGH) published 2026-06-23. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.9Exploit: NoneExposed: 0

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

Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
—
EPSS
84.2%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 25, 2026

Advisory Details (2)

Auto-updated Jul 19, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Flowise MCP Security Bypass Enables RCE · Advisory · FlowiseAI/Flowise · GitHub

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m99r-2hxc-cp3q
generic

Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowise-remote-code-execution-via-mcp-security-bypass-in-validatecommandflags-and-validateargsforlocalfileaccess

Vendor Advisories for CVE-2026-56274(1)

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

Affected Packages

(2 across 1 ecosystem)
npm(2)
PackageVulnerable rangeFixed inDependents
flowise—3.1.2—
flowise-components—3.1.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 172× 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 172 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56274?
CVE-2026-56274 is a critical vulnerability published on June 23, 2026. Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for…
When was CVE-2026-56274 disclosed?
CVE-2026-56274 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56274 actively exploited?
CVE-2026-56274 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56274?
CVE-2026-56274 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-56274?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56274, 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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