VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 8.8 highEPSS 40% probability of exploitation in 30 days
Langflow

CVE-2026-5027: Langflow - Path Traversal Arbitrary File Write via upload_user_file

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
40%

Up from 4.8% on .

EPSS score, percentile 98.6 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
8.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • unspecified

Versions by product

Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

langflow-ai langflow
StatusVersions
Affectedunspecified

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

About this vulnerability

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Summary: CVE record, as of .

  • CISA has not added CVE-2026-5027 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
  • The CVE record was published on 27 Mar 2026.
  • The CVE record carries a CVSS v3.1 base score of 8.8 (High), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 40% (percentile 98.6), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
  • CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact total.

Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.

Description

Langflow - Path Traversal Arbitrary File Write via upload_user_file

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Source: CVE List, as of . About the data.

Weakness

CWE-22
  • CWE-22: Improper Limitation of a Pathname to a Restricted Directory

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published

References

1

Known exploited Langflow vulnerabilities

  • CVE-2026-0770: Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability (added )
  • CVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability (added )
  • CVE-2025-34291: Langflow Origin Validation Error Vulnerability (added )
  • CVE-2026-33017: Langflow Code Injection Vulnerability (added )
  • CVE-2025-3248: Langflow Missing Authentication Vulnerability (added )