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CVE-2026-18891— Langflow is affected by multiple authentication bypass, path traversal, authorization, and server-side request forgery vulnerabilities

Quick assessment

Affected
IBM Langflow OSS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM Langflow OSS（开源版）1.0.0 至 1.11.1 版本中，由于身份验证机制存在缺陷，可能允许远程攻击者执行任意工作流（flows），从而访问敏感信息。

CVSS 8.2 · High
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I. Basic Information for CVE-2026-18891

Vulnerability Information
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Vulnerability Title
Langflow is affected by multiple authentication bypass, path traversal, authorization, and server-side request forgery vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM Langflow OSS 1.0.0 ~ 1.11.1 cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18891

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III. Intelligence Information for CVE-2026-18891

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Vendor Advisories for CVE-2026-18891 (1)

Same Patch Batch · IBM · 2026-08-28 · 16 CVEs total

CVE-2026-19295 9.9 CRITICAL Langflow is affected by multiple remote code execution vulnerabilities due to insufficient
CVE-2026-18527 9.9 CRITICAL IBM Application Runtime Expert (ARE) for IBM i is vulnerable to a user gaining elevated pr
CVE-2026-19286 9.8 CRITICAL Langflow is affected by multiple remote code execution vulnerabilities due to insufficient
CVE-2026-3627 9.1 CRITICAL Multiple Vulnerabilities in IBM Concert Software
CVE-2026-18729 8.8 HIGH Langflow is affected by multiple remote code execution vulnerabilities due to insufficient
CVE-2026-18904 8.2 HIGH Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-18899 7.5 HIGH Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-17203 7.5 HIGH IBM Application Runtime Expert (ARE) for IBM i is vulnerable to a user gaining elevated pr
CVE-2026-16821 7.0 HIGH Vulnerabilities in IBM AIX and PowerVM VIOS
CVE-2026-19294 6.4 MEDIUM Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-3686 6.2 MEDIUM Vulnerabilities exists in IBM Cloud Pak for Data System
CVE-2025-64649 5.9 MEDIUM Multiple Vulnerabilities in IBM Concert Software
CVE-2025-36290 5.9 MEDIUM IBM Integrated Analytics System (IIAS) is affected by improper SSL/TLS certificate validat
CVE-2025-36271 5.9 MEDIUM IBM Integrated Analytics System (IIAS) is affected by a predictable salt vulnerability in
CVE-2026-18545 4.3 MEDIUM Langflow is affected by multiple authentication bypass, path traversal, authorization, and

IV. Related Vulnerabilities

Same product: Langflow OSS
Same vendor: IBM
Same weakness: CWE-287

V. Comments for CVE-2026-18891

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