CVE-2026-18891: CWE-287 Improper Authentication in IBM Langflow OSS
Description
IBM Langflow OSS versions 1.0.0 through 1.11.1 contain an improper authentication vulnerability that could allow a remote attacker to execute arbitrary flows and access sensitive information without proper authorization. This vulnerability is identified as CWE-287 and has a high severity rating with a CVSS score of 8.2. No official patch or remediation guidance has been provided by the vendor as of the published date.
CVSS v3.1
Score 8.2high
Affected software
IBM
Langflow OSS
cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:langflow_oss:1.11.1:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-18891 is an improper authentication vulnerability in IBM Langflow OSS versions 1.0.0 through 1.11.1. Due to insufficient authentication controls, a remote attacker can execute arbitrary flows and gain access to sensitive information. The vulnerability has a CVSS 3.1 base score of 8.2, indicating high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. There is no vendor advisory or patch available at this time, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation allows a remote attacker to bypass authentication mechanisms, execute arbitrary flows, and access sensitive information within IBM Langflow OSS. This could lead to unauthorized data disclosure and potential manipulation of application workflows. There is no indication of availability impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to IBM Langflow OSS instances and monitor for unauthorized access attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-08-04T19:48:56.798Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9206c3acd9273b4963ce9c
Added to database: 08/28/2026, 22:08:03 UTC
Last enriched: 09/07/2026, 15:54:56 UTC
Last updated: 10/13/2026, 18:48:18 UTC
Views: 184
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