How severe is CVE-2026-21445?

CVE-2026-21445 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-21445 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21445?

CVE-2026-21445 affects Langflow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21445?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-21445 have an EU (EUVD) identifier?

Yes. CVE-2026-21445 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0034.

When was CVE-2026-21445 published?

CVE-2026-21445 was published on 2026-01-02 and last updated on 2026-06-17.

CVE-2026-21445

CVE-2026-21445 is a critical-severity vulnerability in Langflow with a CVSS 3.x base score of 9.1. Its EPSS exploit-prediction score of 21% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 8.8
EPSS exploit prediction: 21% (97th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-0034
Weakness: CWE-306
Affected product: Langflow
Published: 2026-01-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-21445?: 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.
How severe is CVE-2026-21445?: CVE-2026-21445 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-21445 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21445?: CVE-2026-21445 affects Langflow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21445?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-21445 have an EU (EUVD) identifier?: Yes. CVE-2026-21445 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0034.
When was CVE-2026-21445 published?: CVE-2026-21445 was published on 2026-01-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*

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