Langflow: IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to execute arbitrary flows…
Langflow
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- Severity
- High, CVSS 8.2
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- Record
- CVE-2026-18891
- Affects
- Langflow
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- August 28, 2026
- Source last modified
- August 31, 2026
Description
IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to execute arbitrary flows and access sensitive information due to improper authentication.
Description quoted from the NVD record.
Who is affected
Langflow (also called IBM Langflow OSS) is a tool for building apps that use AI language models. In Langflow, these apps are made by linking steps into workflows called flows. This flaw affects versions 1.0.0 through 1.11.1. Because the product does not properly check who is making a request, an attacker over a network could run any flow and get access to sensitive information. If your organization runs Langflow at one of these versions, this problem applies to you. This flaw is rated High.
What to do
- The person who installed or runs Langflow for your organization should check which version is in use. Versions 1.0.0 through 1.11.1 are affected.
- No fixed version is named for this flaw yet, so check the vendor advisory linked on this page for a fixed release and install it as soon as one is available.
- If an IT provider or vendor runs Langflow for your organization, send them this advisory and ask when the update will be done.
Analysis written from the source record as of August 31, 2026 and reviewed before publishing.