CVE-2026-12821— FlowiseAI Flowise S3 Document Loader S3.ts path traversal
Quick assessment
Affected
FlowiseAI Flowise
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.
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise存在路径遍历漏洞，该漏洞源于S3 Document Loader组件中的文件packages/components/nodes/documentloaders/S3/S3.ts存在未知函数，可能导致路径遍历攻击。
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1083 · File and Directory Discovery T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-12821
Vulnerability Information
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Vulnerability Title
FlowiseAI Flowise S3 Document Loader S3.ts path traversal
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in FlowiseAI Flowise up to 3.1.2. The impacted element is an unknown function of the file packages/components/nodes/documentloaders/S3/S3.ts of the component S3 Document Loader. Executing a manipulation can lead to path traversal. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise存在路径遍历漏洞，该漏洞源于S3 Document Loader组件中的文件packages/components/nodes/documentloaders/S3/S3.ts存在未知函数，可能导致路径遍历攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-12821
| # | POC Description | Source Link | Shenlong Link |
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Other References for CVE-2026-12821 (1)
IV. Related Vulnerabilities
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Same vendor: FlowiseAI
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CVE-2026-100610
Flowise through 3.1.4 Missing Authorization via upsert-histo -
CVE-2026-100609
Flowise through 3.1.4 Insecure Direct Object Reference via C -
CVE-2026-100608
Flowise through 3.1.4 Authorization Bypass via BullMQ Dashbo -
CVE-2026-100607
Flowise through 3.1.4 Authentication Bypass via Email-Only S -
CVE-2026-100606
Flowise through 3.1.4 Authentication Bypass via SSO Email Ma
Same weakness: CWE-22
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V. Comments for CVE-2026-12821
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