CVE-2026-8505Network attack vector

Unauthenticated flow execution via disabled webhook authentication

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 execute flows through webhook endpoints. The webhook handler treats WEBHOOK_AUTH_ENABLE=False, the default, as permission to skip API-key validation and run a requested flow as its owner. A remote attacker must know a flow UUID; when that flow contains executable components, owner-context execution runs server-side code or interrupts the service.

CVSS severity9.8
Critical
EPSS probability0.57%
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 execute flows through webhook endpoints. The webhook handler treats WEBHOOK_AUTH_ENABLE=False, the default, as permission to skip API-key validation and run a requested flow as its owner. A remote attacker must know a flow UUID; when that flow contains executable components, owner-context execution runs server-side code or interrupts the service.

The record

CVE
CVE-2026-8505
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-306, T1190
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?

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  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

9.8IBMCVSS: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.

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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
T1190Exploit Public-Facing Application

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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