CVE-2026-9103: CWE-306 Missing Authentication for Critical Function in IBM Langflow OSS
IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to gain unauthorized access due to improper authentication in the /api/v1/login/auto_login endpoint. The endpoint issues long-lived superuser bearer tokens without requiring authentication when the AUTO_LOGIN configuration is enabled (enabled by default), which may allow an unauthenticated network attacker to obtain full administrative access. Additionally, permissive cross-origin resource sharing (CORS) settings may allow tokens to be exposed to unintended origins, increasing the risk of unauthorized access.
AI Analysis
Technical Summary
CVE-2026-9103 is a critical authentication bypass vulnerability in IBM Langflow OSS (versions 1.0.0 through 1.10.0). The vulnerability arises from the /api/v1/login/auto_login endpoint issuing long-lived superuser bearer tokens without requiring any authentication when the AUTO_LOGIN feature is enabled by default. This allows remote attackers to obtain full administrative privileges without credentials. Furthermore, the product's permissive CORS configuration can expose these tokens to unintended origins, exacerbating the risk of unauthorized access. The CVSS 3.1 base score is 9.8, reflecting network attack vector, no required privileges or user interaction, and full confidentiality, integrity, and availability impact. No official patch or remediation guidance has been published by IBM as of the data provided.
Potential Impact
An unauthenticated remote attacker can gain full administrative access to IBM Langflow OSS instances with AUTO_LOGIN enabled by default. This compromises confidentiality, integrity, and availability of the affected system. The permissive CORS settings may further expose authentication tokens to unintended external origins, increasing the likelihood of token theft and unauthorized control.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, it is recommended to disable the AUTO_LOGIN configuration to prevent issuance of unauthenticated superuser tokens. Additionally, review and restrict CORS settings to limit token exposure to trusted origins only.
CVE-2026-9103: CWE-306 Missing Authentication for Critical Function in IBM Langflow OSS
Description
IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to gain unauthorized access due to improper authentication in the /api/v1/login/auto_login endpoint. The endpoint issues long-lived superuser bearer tokens without requiring authentication when the AUTO_LOGIN configuration is enabled (enabled by default), which may allow an unauthenticated network attacker to obtain full administrative access. Additionally, permissive cross-origin resource sharing (CORS) settings may allow tokens to be exposed to unintended origins, increasing the risk of unauthorized access.
CVSS v3.1
Score 9.8critical
Affected software
pkg:github/ibm/langflow_osscpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:langflow_oss:1.10.0:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-9103 is a critical authentication bypass vulnerability in IBM Langflow OSS (versions 1.0.0 through 1.10.0). The vulnerability arises from the /api/v1/login/auto_login endpoint issuing long-lived superuser bearer tokens without requiring any authentication when the AUTO_LOGIN feature is enabled by default. This allows remote attackers to obtain full administrative privileges without credentials. Furthermore, the product's permissive CORS configuration can expose these tokens to unintended origins, exacerbating the risk of unauthorized access. The CVSS 3.1 base score is 9.8, reflecting network attack vector, no required privileges or user interaction, and full confidentiality, integrity, and availability impact. No official patch or remediation guidance has been published by IBM as of the data provided.
Potential Impact
An unauthenticated remote attacker can gain full administrative access to IBM Langflow OSS instances with AUTO_LOGIN enabled by default. This compromises confidentiality, integrity, and availability of the affected system. The permissive CORS settings may further expose authentication tokens to unintended external origins, increasing the likelihood of token theft and unauthorized control.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, it is recommended to disable the AUTO_LOGIN configuration to prevent issuance of unauthenticated superuser tokens. Additionally, review and restrict CORS settings to limit token exposure to trusted origins only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-05-20T16:49:30.512Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5b5eb32d1edb114c7fb4fa
Added to database: 07/18/2026, 11:08:35 UTC
Last enriched: 07/18/2026, 11:57:12 UTC
Last updated: 07/18/2026, 13:31:24 UTC
Views: 5
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