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CVE-2026-21445

Langflow authentication bypass

9.1 CRITICALPublic exploitEPSS 33.3%
  1. Published2 Jan 2026

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories, and perform destructive operations including message deletion. This affects endpoints handling personal data and system operations that should require proper authorization. Version 1.7.0.dev45 contains a patch.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Langflow< 1.7.1

Remediation

Fixed in
Langflow≥ 1.7.1

References

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Frequently asked

Is CVE-2026-21445 being actively exploited?

CVE-2026-21445 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 33.3%.

How severe is CVE-2026-21445?

CVE-2026-21445 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 33.3% probability of exploitation.

Which products are affected by CVE-2026-21445?

Affected products include Langflow.

How do I fix CVE-2026-21445?

Upgrade affected software to a fixed version, for example Langflow 1.7.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-21445 against the real software inventory on every managed device, as each hourly inventory arrives. 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.