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
Trending — 3 sources updated this weekElevated
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)
EPSS
84.0%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 25, 2026

Advisory Details (2)

Auto-updated Jul 4, 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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 88× in last 7d / 167× 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 167 total refreshes for this CVE.

  1. 2026-07-07 00:27 UTCEG score recompute
  2. 2026-07-07 00:27 UTCGHSA enrichment
  3. 2026-07-06 20:11 UTCEG score recompute
  4. 2026-07-06 20:11 UTCGHSA enrichment
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 15:40 UTCEG score recompute
  8. 2026-07-06 15:40 UTCGHSA enrichment
  9. 2026-07-06 11:23 UTCEG score recompute
  10. 2026-07-06 11:23 UTCGHSA enrichment
  11. 2026-07-06 06:58 UTCEG score recompute
  12. 2026-07-06 06:58 UTCGHSA enrichment
  13. 2026-07-06 02:41 UTCEG score recompute
  14. 2026-07-06 02:41 UTCGHSA enrichment
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-05 22:25 UTCEG score recompute
  18. 2026-07-05 22:25 UTCGHSA enrichment
  19. 2026-07-05 18:07 UTCEG score recompute
  20. 2026-07-05 18:07 UTCGHSA enrichment
  21. 2026-07-05 13:48 UTCEG score recompute
  22. 2026-07-05 13:48 UTCGHSA enrichment
  23. 2026-07-05 09:33 UTCEG score recompute
  24. 2026-07-05 09:33 UTCGHSA enrichment
  25. 2026-07-05 05:17 UTCEG score recompute
Show 75 more
  1. 2026-07-05 05:17 UTCGHSA enrichment
  2. 2026-07-05 02:31 UTCEPSS rescore
  3. 2026-07-05 02:30 UTCEPSS rescore
  4. 2026-07-05 00:36 UTCEG score recompute
  5. 2026-07-05 00:36 UTCGHSA enrichment
  6. 2026-07-04 20:19 UTCEG score recompute
  7. 2026-07-04 20:19 UTCGHSA enrichment
  8. 2026-07-04 16:04 UTCEG score recompute
  9. 2026-07-04 16:04 UTCGHSA enrichment
  10. 2026-07-04 11:47 UTCEG score recompute
  11. 2026-07-04 11:47 UTCGHSA enrichment
  12. 2026-07-04 07:31 UTCEG score recompute
  13. 2026-07-04 07:30 UTCGHSA enrichment
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-04 03:01 UTCEG score recompute
  17. 2026-07-04 03:00 UTCGHSA enrichment
  18. 2026-07-03 22:39 UTCEG score recompute
  19. 2026-07-03 22:39 UTCGHSA enrichment
  20. 2026-07-03 18:22 UTCEG score recompute
  21. 2026-07-03 18:22 UTCGHSA enrichment
  22. 2026-07-03 14:06 UTCEG score recompute
  23. 2026-07-03 14:06 UTCGHSA enrichment
  24. 2026-07-03 09:50 UTCEG score recompute
  25. 2026-07-03 09:50 UTCGHSA enrichment
  26. 2026-07-03 05:35 UTCEG score recompute
  27. 2026-07-03 05:35 UTCGHSA enrichment
  28. 2026-07-03 01:17 UTCEG score recompute
  29. 2026-07-03 01:17 UTCGHSA enrichment
  30. 2026-07-02 21:01 UTCEG score recompute
  31. 2026-07-02 21:00 UTCGHSA enrichment
  32. 2026-07-02 16:45 UTCEG score recompute
  33. 2026-07-02 16:45 UTCGHSA enrichment
  34. 2026-07-02 12:29 UTCEG score recompute
  35. 2026-07-02 12:29 UTCGHSA enrichment
  36. 2026-07-02 08:13 UTCEG score recompute
  37. 2026-07-02 08:13 UTCGHSA enrichment
  38. 2026-07-02 03:57 UTCEG score recompute
  39. 2026-07-02 03:56 UTCGHSA enrichment
  40. 2026-07-01 23:41 UTCEG score recompute
  41. 2026-07-01 23:41 UTCGHSA enrichment
  42. 2026-07-01 19:25 UTCEG score recompute
  43. 2026-07-01 19:25 UTCGHSA enrichment
  44. 2026-07-01 15:09 UTCEG score recompute
  45. 2026-07-01 15:09 UTCGHSA enrichment
  46. 2026-07-01 15:07 UTCEPSS rescore
  47. 2026-07-01 10:53 UTCEG score recompute
  48. 2026-07-01 10:53 UTCGHSA enrichment
  49. 2026-07-01 06:35 UTCEG score recompute
  50. 2026-07-01 06:35 UTCGHSA enrichment
  51. 2026-07-01 02:19 UTCEG score recompute
  52. 2026-07-01 02:19 UTCGHSA enrichment
  53. 2026-06-30 23:22 UTCEPSS rescore
  54. 2026-06-30 22:03 UTCEG score recompute
  55. 2026-06-30 22:03 UTCGHSA enrichment
  56. 2026-06-30 17:45 UTCEG score recompute
  57. 2026-06-30 17:45 UTCGHSA enrichment
  58. 2026-06-30 13:29 UTCEG score recompute
  59. 2026-06-30 13:29 UTCGHSA enrichment
  60. 2026-06-30 09:12 UTCEG score recompute
  61. 2026-06-30 09:12 UTCGHSA enrichment
  62. 2026-06-30 04:56 UTCEG score recompute
  63. 2026-06-30 04:56 UTCGHSA enrichment
  64. 2026-06-30 00:28 UTCEG score recompute
  65. 2026-06-30 00:28 UTCGHSA enrichment
  66. 2026-06-29 20:13 UTCEG score recompute
  67. 2026-06-29 20:13 UTCGHSA enrichment
  68. 2026-06-29 15:57 UTCEG score recompute
  69. 2026-06-29 15:57 UTCGHSA enrichment
  70. 2026-06-29 11:42 UTCEG score recompute
  71. 2026-06-29 11:42 UTCGHSA enrichment
  72. 2026-06-29 07:26 UTCEG score recompute
  73. 2026-06-29 07:26 UTCGHSA enrichment
  74. 2026-06-29 03:10 UTCEG score recompute
  75. 2026-06-29 03:10 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 84.0% 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.

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