THREATPORT/VULNERABILITY/CVE-2026-21445
CRITICAL SEVERITY

CVE-2026-21445

Langflow vulnerability

CVSS
9.1
EPSS
20.7%
EPSS pct
97th
Exploited
No known
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.
Affected vendor
Langflow
Affected product
Langflow
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness type (CWE)
  • CWE-306 — Missing Authentication for Critical Function
Published
2026-01-02

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity.

Its EPSS score of 20.7% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2026-21445

  • Confirm whether Langflow Langflow is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-21445.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-21445

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-21445 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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