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CVE-2026-32859— ByteDance DeerFlow Stored XSS via Inline Artifact Rendering

Quick assessment

Affected
Bytedance Inc. DeerFlow
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.

DeerFlow是Bytedance开源的一个开源智能体编排框架，用于协调子代理与技能执行。 DeerFlow 5dbb362之前版本存在安全漏洞，该漏洞源于artifacts API中存在存储型跨站脚本，攻击者可通过上传恶意HTML或脚本内容作为工件来存储恶意内容，可能导致用户查看工件时在浏览器环境中执行任意脚本，引发会话泄露、凭据窃取和任意脚本执行。

CVSS 5.4 · Medium EPSS 0.34% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
Bytedance Inc. DeerFlow < 5dbb3623b2f0e490c8bb3cd81b1e3b1b12eae1a6 affected
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I. Basic Information for CVE-2026-32859

Vulnerability Information
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Vulnerability Title
ByteDance DeerFlow Stored XSS via Inline Artifact Rendering
Source: CVE Program / CVE List V5
Vulnerability Description
ByteDance DeerFlow versions prior to commit 5dbb362 contain a stored cross-site scripting vulnerability in the artifacts API that allows attackers to execute arbitrary scripts by uploading malicious HTML or script content as artifacts. Attackers can store malicious content that executes in the browser context when users view artifacts, leading to session compromise, credential theft, and arbitrary script execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
DeerFlow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DeerFlow是Bytedance开源的一个开源智能体编排框架，用于协调子代理与技能执行。 DeerFlow 5dbb362之前版本存在安全漏洞，该漏洞源于artifacts API中存在存储型跨站脚本，攻击者可通过上传恶意HTML或脚本内容作为工件来存储恶意内容，可能导致用户查看工件时在浏览器环境中执行任意脚本，引发会话泄露、凭据窃取和任意脚本执行。
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

Vendor Product Affected Versions CPE Subscribe
Bytedance Inc. DeerFlow 0 ~ 5dbb3623b2f0e490c8bb3cd81b1e3b1b12eae1a6 -

II. Public POCs for CVE-2026-32859

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III. Intelligence Information for CVE-2026-32859

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Patches & Fixes for CVE-2026-32859 (2)

Vendor Advisories for CVE-2026-32859 (1)

IV. Related Vulnerabilities

Same product: DeerFlow
Same vendor: Bytedance Inc.
Same weakness: CWE-79

V. Comments for CVE-2026-32859

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