CVE-2026-18904: CWE-639 Authorization Bypass Through User-Controlled Key in IBM Langflow OSS
Description
IBM Langflow OSS versions 1.0.0 through 1.11.1 contain an authorization bypass vulnerability due to a namespace collision between user identifiers. This flaw could allow a remote attacker to access sensitive information and inject unauthorized messages. The vulnerability is identified as CWE-639 and has a high severity with a CVSS score of 8.2.
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-2026-18904 is an authorization bypass vulnerability in IBM Langflow OSS versions 1.0.0 through 1.11.1. The issue arises from a namespace collision between user-controlled identifiers, which can be exploited remotely without privileges or user interaction. This allows attackers to obtain sensitive information and inject unauthorized messages. The vulnerability is classified under CWE-639 (Authorization Bypass Through User-Controlled Key).
Potential Impact
Successful exploitation could lead to unauthorized disclosure of sensitive information and injection of unauthorized messages, potentially compromising confidentiality and integrity. There is no indication of availability impact. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Users should monitor IBM advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-08-04T20:18:20.138Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9206c3acd9273b4963cea0
Added to database: 08/28/2026, 22:08:03 UTC
Last enriched: 09/07/2026, 15:25:20 UTC
Last updated: 10/11/2026, 06:48:15 UTC
Views: 64
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