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IBM Langflow OSS CVE-2026-19294

| EUVDEUVD-2026-67957 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-08-28 ibm GHSA-m52h-5vqv-r8wf
Authentication Bypass IBM Langflow Oss
6.5
CVSS 3.1 · NVD
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Severity by source

Vendor (ibm) PRIMARY
MEDIUM
qualitative
NVD
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.4 MEDIUM

Network API exploitation requires only a valid account (PR:L); cross-user data boundary crossing warrants S:C; no availability impact applies.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (ibm).

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
CVSS changed
Aug 31, 2026 - 21:52 NVD
6.4 (MEDIUM) 6.5 (MEDIUM)
Analysis Generated
Aug 28, 2026 - 22:40 vuln.today

DescriptionNVD

IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote authenticated attacker to execute and read any user's private flow due to improper authorization.

AnalysisAI

Broken object-level authorization in IBM Langflow OSS 1.0.0 through 1.11.1 allows any authenticated network user to read and execute private flows belonging to other users. The flaw (CWE-639) stems from the application accepting user-controlled flow identifiers in API requests without verifying that the requesting account owns the targeted resource - a classic horizontal privilege escalation path. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation A valid authenticated user account on the IBM Langflow OSS instance is required (CVSS PR:L); unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N scores 6.4 (Medium), reflecting network accessibility, low attack complexity, and the need only for a valid user account. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor-released patch per IBM Security Advisory at https://www.ibm.com/support/pages/node/7284579. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-19294 vulnerability details – vuln.today
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