CVE-2026-10547Network attack vector

Cross-user workflow manipulation via unchecked cache writes

Published Aug 5, 2026 · Updated Aug 5, 2026

Improper access control in IBM Langflow OSS 1.0.0 through 1.10.3 allows remote authenticated users to corrupt shared flow cache data. The deprecated POST /api/v1/build/{flow_id}/vertices endpoint accepts supplied graph data for any flow without verifying that the requester owns it. Only multi-user deployments with LANGFLOW_AUTO_LOGIN=False are affected; successful abuse can execute another user's workflow or interrupt service.

CVSS severity5.9
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in IBM Langflow OSS 1.0.0 through 1.10.3 allows remote authenticated users to corrupt shared flow cache data. The deprecated POST /api/v1/build/{flow_id}/vertices endpoint accepts supplied graph data for any flow without verifying that the requester owns it. Only multi-user deployments with LANGFLOW_AUTO_LOGIN=False are affected; successful abuse can execute another user's workflow or interrupt service.

The record

CVE
CVE-2026-10547
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-284, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 <=1.10.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.10.3

Published CVSS scores

5.9IBM CorporationCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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.

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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-284Improper Access Control
T1565.001Stored Data Manipulation

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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