CVE-2026-6542Network attack vector

Cross-user data access and deletion via unchecked ownership

Published Apr 30, 2026 · Updated Apr 30, 2026

IDOR in the Monitor API in Langflow OSS 1.0.0 through 1.8.4 allows remote authenticated users to access or delete other users' data. The monitor endpoints accept a caller-supplied flow_id and query or delete transaction logs and vertex build records without verifying that the flow belongs to the caller. Exploitation requires an authenticated account and a target flow identifier; exposed data can include user inputs, prompt templates, model responses, configuration data, and build state.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IDOR in the Monitor API in Langflow OSS 1.0.0 through 1.8.4 allows remote authenticated users to access or delete other users' data. The monitor endpoints accept a caller-supplied flow_id and query or delete transaction logs and vertex build records without verifying that the flow belongs to the caller. Exploitation requires an authenticated account and a target flow identifier; exposed data can include user inputs, prompt templates, model responses, configuration data, and build state.

The record

CVE
CVE-2026-6542
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
OpenBMC Project
Product
Langflow OSS
Classifications
CWE-639, 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=1.0.0 <=1.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBMC Project · Langflow OSSversion=1.0.0 <=1.8.4

Published CVSS scores

6.5IBM CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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-639Authorization Bypass Through User-Controlled Key
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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