CVE-2026-9186— Langflow is vulnerable to stored cross-site scripting and IP spoofing due to unsanitized Markdown rendering and untrusted proxy header trust
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 版本 1.0.0 至 1.11.2 存在漏洞：经过身份验证的远程攻击者可以通过伪造 请求头，绕过“仅限 localhost”的 MCP 配置安装限制，从而实现对 IDE 配置文件（如 等）的任意写入。
Possible ATT&CK Techniques 2 AI
T1557 · Adversary-in-the-Middle T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| IBM | Langflow OSS | 1.0.0≤ 1.11.2 |
affected |
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I. Basic Information for CVE-2026-9186
Vulnerability Information
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Vulnerability Title
Langflow is vulnerable to stored cross-site scripting and IP spoofing due to unsanitized Markdown rendering and untrusted proxy header trust
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration installation by spoofing X-Forwarded-For: 127.0.0.1 header, enabling arbitrary writes to IDE config files (~/.cursor/mcp.json, etc.).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| IBM | Langflow OSS | 1.0.0 ~ 1.11.2 |
cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*
|
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II. Public POCs for CVE-2026-9186
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9186 (1)
Same Patch Batch · IBM · 2026-09-04 · 64 CVEs total
| CVE-2026-18658 | 9.8 CRITICAL | IBM Operational Decision Manager for Aug 2026 - Multiple CVEs addressed |
| CVE-2026-19274 | 9.6 CRITICAL | IBM Instana Observability is affected by multiple vulnerabilities within Instana Agent con |
| CVE-2026-19298 | 8.8 HIGH | Langflow is vulnerable to remote code execution due to authorization policy bypass in the |
| CVE-2026-18486 | 8.8 HIGH | IBM ContextForge MCP Gateway is affected by credential disclosure and privilege escalation |
| CVE-2026-19305 | 8.6 HIGH | Langflow is vulnerable to Server-Side Request Forgery due to missing or bypassable URL val |
| CVE-2026-77822 | 8.2 HIGH | IBM ContextForge MCP Gateway is affected by server-side request forgery (DNS rebinding) vi |
| CVE-2026-19303 | 8.1 HIGH | Langflow is vulnerable to arbitrary file write and arbitrary file deletion due to unvalida |
| CVE-2026-18221 | 8.1 HIGH | IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DR |
| CVE-2026-18175 | 8.1 HIGH | IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DR |
| CVE-2026-19306 | 7.7 HIGH | Langflow is vulnerable to arbitrary local file read due to path traversal in ChatInput, bu |
| CVE-2026-19283 | 7.7 HIGH | IBM Instana Observability is affected by multiple vulnerabilities within Instana Agent con |
| CVE-2026-81832 | 7.7 HIGH | IBM App Connect Enterprise and IBM Integration Bus for z/OS Adapter nodes are vulnerable t |
| CVE-2026-19304 | 7.7 HIGH | Langflow is vulnerable to Server-Side Request Forgery due to missing or bypassable URL val |
| CVE-2026-18905 | 7.7 HIGH | IBM ContextForge MCP Gateway is affected by server-side request forgery via DNS TOCTOU at |
| CVE-2026-19300 | 7.5 HIGH | Langflow is vulnerable to information disclosure due to cross-user MCP tool cache collisio |
| CVE-2026-18489 | 7.4 HIGH | IBM ContextForge Translate is affected by cross-client credential context confusion |
| CVE-2026-5522 | 6.7 MEDIUM | QRadar contains hard-coded credentials |
| CVE-2026-17057 | 6.5 MEDIUM | IBM i is Affected By Denial of Service Vulnerabilities in NFS [, ] |
| CVE-2026-17622 | 6.5 MEDIUM | Langflow OSS is affected by arbitrary file read due to path traversal vulnerabilities in f |
| CVE-2026-17207 | 6.5 MEDIUM | IBM i is Affected By Denial of Service Vulnerabilities in NFS [, ] |
Showing top 20 of 64 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-9186
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