CVE-2026-18904: Langflow is affected by multiple authentication bypass, path traversal, authorization, and server-side request forgery vulnerabilities
Published Aug 21, 2026
·Updated
IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to obtain sensitive information and inject unauthorized messages due to a namespace collision between user identifiers.
Other sources
Langflow OSS could allow a remote attacker to obtain sensitive information and inject unauthorized messages due to a namespace collision between user identifiers.
— IBM
Affected Software
1 affected component
IBM Langflow OSS<=1.0.0-1.11.1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
IBM Langflow OSSto a version that resolves this vulnerability.Fixed in 1.11.2
Event History
Aug 21, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Aug 28, 2026
CVE Published
via MITRE·08:52 PM
Data Sourced
via MITRE·08:52 PM
RemedyDescriptionSeverityWeakness
Frequently Asked Questions
1
Does exploitation require an authenticated account or user interaction?
No. The CVSS vector indicates the issue can be exploited remotely with low attack complexity, without privileges or user interaction.