CVE-2026-9198criticalunder attackCWE-94

CVE-2026-9198: critical vulnerability in IBM Langflow OSS

Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation

Published · Updated

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98Vexday Risk Score

Patch now. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a working public exploit.

ssvc Actcvss 9.8epss 29%
from disclosure to weapon4 days
Published on NVDJul 17
1st PoC+4d
metasploitJul 17
CISA KEV+18d
Official alert in Brazil

Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.

Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
Action required by CISAfederal deadline: 2026-08-07

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

In short

IBM Langflow has a critical flaw that lets anyone on the network run code on the server without needing a password. An attacker can bypass login protections and execute arbitrary commands, taking over the entire system.

Technical detail

CVE-2026-9198 chains two API endpoints: /api/v1/auto_login issues SUPERUSER tokens to unauthenticated network callers, and /api/v1/validate/code executes arbitrary Python code via exec(). An attacker with network access can obtain elevated privileges and achieve remote code execution on default deployments (CVSS 9.8).

Summary generated and translated by AI from the official description.
IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/auto_login (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
IBM · Langflow OSS
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — IBM Langflow OSS

In the same product, most dangerous first.

CVE-2026-93674CRITICALLangflow OSS is affected by multiple vulnerabilitiesEPSS 15.3%CVE-2026-7873CRITICALCode Injection Vulnerability in Code Validation EndpointEPSS 6.2%CVE-2026-9103CRITICALUnauthenticated Superuser Token Issuance via Auto-Login EndpointEPSS 3.2%CVE-2026-10134CRITICALUnauthenticated Server-Side RCE via PythonCodeStructuredTool in Public FlowsEPSS 2.3%CVE-2026-93680CRITICALLangflow OSS is affected by multiple vulnerabilitiesEPSS 2.2%CVE-2026-19295CRITICALLangflow is affected by multiple remote code execution vulnerabilities due to insufficient code-execution policy enforcementEPSS 1.6%