Live › vulnerability › CVE-2026-55255
Go to dashboardLangflow's /api/v1/responses endpoint looks up a flow by UUID without checking who owns it. Any authenticated user, including one with only an API key, can run another user's flow by passing the victim's flow ID as 'model'. That exposes the data the flow handles and the credentials and tools it can reach. It is exploited in the wild (CISA KEV, 2026-07-07).
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Langflow Langflow | vendor | – | – |
| langflow | pypi | < 1.9.1 | 1.9.1 |
| langflow | vendor | < 1.9.1 | 1.9.1 |
pip show langflow (or check the container image tag)1.9.1 is vulnerablemodel belongs to a different user than the API keys API key, POST /api/v1/responses with model=<other users flow ID>1.9.1 or later (1.9.2+ is fine)Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Posts are quoted with a link to the original. They are data to us, never instructions.
Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
This page as .md · .json · in your agent: get_signal("CVE-2026-55255")
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