CVE-2026-9202Network attack vector

Unauthenticated account creation via unchecked registration handler

Published Jul 17, 2026 · Updated Jul 17, 2026

Authentication bypass in IBM Langflow OSS 1.0.0 through 1.10.0 allows remote attackers to create unlimited user accounts. The POST /api/v1/users/ registration handler accepts anonymous user records without enforcing the deployment's signup or authentication policy and persists them in the user database. The endpoint is remotely reachable without credentials; NEW_USER_IS_ACTIVE=true turns created accounts into access to code-execution endpoints running with service privileges.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in IBM Langflow OSS 1.0.0 through 1.10.0 allows remote attackers to create unlimited user accounts. The POST /api/v1/users/ registration handler accepts anonymous user records without enforcing the deployment's signup or authentication policy and persists them in the user database. The endpoint is remotely reachable without credentials; NEW_USER_IS_ACTIVE=true turns created accounts into access to code-execution endpoints running with service privileges.

The record

CVE
CVE-2026-9202
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-306, CAPEC-216, CAPEC-166, CAPEC-62, CAPEC-36, CAPEC-12, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 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=1.0.0 <=1.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.10.0

Published CVSS scores

9.8IBM CorporationCVSS:3.1/AV:N/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CAPEC-216Communication Channel Manipulation
CAPEC-166Force the System to Reset Values
CAPEC-62Cross Site Request Forgery
CAPEC-36Using Unpublished Interfaces or Functionality
CAPEC-12Choosing Message Identifier
T1136Create Account

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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