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IBM Langflow OSS CVE-2026-18891

| EUVDEUVD-2026-67953 HIGH
Improper Authentication (CWE-287)
2026-08-28 ibm GHSA-7rh9-6r38-qv3f
Authentication Bypass IBM Langflow Oss
8.2
CVSS 3.1 · Vendor: ibm
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Severity by source

Vendor (ibm) PRIMARY
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
vuln.today AI
8.2 HIGH

Network-accessible auth bypass requires no credentials or interaction; C:H reflects sensitive data exposure; I:L for limited flow execution write impact; A:N as no availability disruption is described.

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

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

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

Lifecycle Timeline

2
Analysis Generated
Aug 28, 2026 - 22:30 vuln.today
CVE Published
Aug 28, 2026 - 20:51 nvd
HIGH 8.2

DescriptionCVE.org

IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to execute arbitrary flows and access sensitive information due to improper authentication.

AnalysisAI

Remote unauthenticated execution of arbitrary AI workflows in IBM Langflow OSS 1.0.0 through 1.11.1 exposes sensitive information via an authentication bypass (CWE-287). The CVSS 3.1 base score of 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N) confirms zero prerequisites - any network-reachable instance can be targeted without credentials. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation No special conditions are required per the CVSS vector (AV:N/AC:L/PR:N/UI:N) - this is remote unauthenticated exploitation against network-accessible IBM Langflow OSS 1.0.0-1.11.1 instances with no non-default configuration required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.2 High rating is well-supported by the vector metrics: AV:N (network-accessible), AC:L (no special conditions), PR:N (no authentication required), and UI:N (no user interaction needed), yielding a low-friction exploitation path. … 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 A patch is available per the vendor advisory at https://www.ibm.com/support/pages/node/7284579; organizations should consult that page for the exact fixed version and upgrade immediately. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and inventory all IBM Langflow OSS instances in your environment, noting which versions are deployed and their network accessibility (Internet-facing vs. …

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CVE-2026-18891 vulnerability details – vuln.today
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