CVE-2026-81268Network attack vector

Flow execution via bypassed and stale API keys

Published Sep 10, 2026 · Updated Sep 10, 2026

Authentication bypass in IBM Langflow OSS 1.0.0 through 1.11.5 allows remote attackers to execute flows and read sensitive data. The MCP HTTP credential resolvers omit the AUTO_LOGIN API-key guard and silently map unauthenticated requests to the superuser, while the database validator accepts keys whose owners are inactive. Default AUTO_LOGIN permits enumeration and execution of every MCP-exposed flow; otherwise, a key issued before account deactivation retains flow execution and sensitive-data access.

CVSS severity8.1
High
EPSS probability0.31%
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 1.11.5 allows remote attackers to execute flows and read sensitive data. The MCP HTTP credential resolvers omit the AUTO_LOGIN API-key guard and silently map unauthenticated requests to the superuser, while the database validator accepts keys whose owners are inactive. Default AUTO_LOGIN permits enumeration and execution of every MCP-exposed flow; otherwise, a key issued before account deactivation retains flow execution and sensitive-data access.

The record

CVE
CVE-2026-81268
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-613, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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 <=1.11.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.11.5

Published CVSS scores

8.1IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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-613Insufficient Session Expiration
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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