CVE-2026-4502Network attack vector

Authenticated code execution via unsanitized upload filenames

Published Apr 30, 2026 · Updated Apr 30, 2026

Path traversal in IBM Langflow Desktop 1.2.0 through 1.8.4 allows remote authenticated users to write arbitrary files via the v2 API. The POST /api/v2/files/ endpoint passes unsanitized multipart filenames containing dot-dot sequences to local storage path handling. Valid credentials and network access to the backend are required; a crafted upload can overwrite host files and execute code with backend privileges.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in IBM Langflow Desktop 1.2.0 through 1.8.4 allows remote authenticated users to write arbitrary files via the v2 API. The POST /api/v2/files/ endpoint passes unsanitized multipart filenames containing dot-dot sequences to local storage path handling. Valid credentials and network access to the backend are required; a crafted upload can overwrite host files and execute code with backend privileges.

The record

CVE
CVE-2026-4502
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
OpenBMC Project
Product
Langflow Desktop
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.2.0 <=1.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBMC Project · Langflow Desktopversion=1.2.0 <=1.8.4

Published CVSS scores

6.5IBM CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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