CVE-2026-55786Known exploitationPublic exploitHinoki check available

Unauthenticated command execution via unguarded MCP dispatch

Published Oct 14, 2026 · Updated Oct 14, 2026

Missing authentication in Flytohub flyto-core 2.26.2 through 2.26.3 allows attackers to execute OS commands via HTTP MCP requests. The POST /mcp handler omits require_auth and forwards untrusted execute_module arguments to sandbox.execute_shell, which passes commands to asyncio.create_subprocess_shell. Access is local under the default loopback binding and remote with a non-loopback binding; execution inherits server-process privileges.

CVSS severity8.4
High
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authentication in Flytohub flyto-core 2.26.2 through 2.26.3 allows attackers to execute OS commands via HTTP MCP requests. The POST /mcp handler omits require_auth and forwards untrusted execute_module arguments to sandbox.execute_shell, which passes commands to asyncio.create_subprocess_shell. Access is local under the default loopback binding and remote with a non-loopback binding; execution inherits server-process privileges.

The record

CVE
CVE-2026-55786
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
Flytohub
Product
flyto-core
Classifications
CWE-306, CWE-78, T1059
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2026Exploitation reportedPrevidian honeypot exploitation attempts
  2. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  3. Oct 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.26.2, < 2.26.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Flytohub · flyto-coreversion=>= 2.26.2, < 2.26.4

Published CVSS scores

8.4GitHub CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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