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CVE-2026-55450

Langflow authentication bypass

9.3 CRITICALPublic exploitEPSS 1.19%
  1. Published23 Jun 2026

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

Affected products

Langflow< 1.9.1

Remediation

Fixed in
Langflow≥ 1.9.1

References

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Frequently asked

Is CVE-2026-55450 being actively exploited?

CVE-2026-55450 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.19%.

How severe is CVE-2026-55450?

CVE-2026-55450 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 1.19% probability of exploitation.

Which products are affected by CVE-2026-55450?

Affected products include Langflow.

How do I fix CVE-2026-55450?

Upgrade affected software to a fixed version, for example Langflow 1.9.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-55450 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.