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CVE-2026-104250— unstructured: Stored XSS via unescaped HTML generation

Quick assessment

Affected
Unstructured-IO unstructured
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.

Unstructured 库提供了用于摄取和预处理图像及文本文档（如 PDF、HTML、Word 文档等）的开源组件。在版本 0.24.1 之前， 和 VLM partitioner 可能会在 中保留不受信任的文档标签、属性、文本以及链接目标，而 函数会将结果以 HTML 文档的形式输出。在 中的 路径未对输出进行转义，也未拒绝不安全的 URL 方案，导致事件处理器属性、属性突破标记和 链接在解析后仍然存活。当生成的 HTML 或 在浏览器中渲染时，攻击者可控的脚本将在查看者的原始上下文中执行，包括在文档摄取工作流

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unstructured-IO unstructured < 0.24.1 affected
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I. Basic Information for CVE-2026-104250

Vulnerability Information
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Vulnerability Title
unstructured: Stored XSS via unescaped HTML generation
Source: CVE Program / CVE List V5
Vulnerability Description
The unstructured library provides open-source components for ingesting and pre-processing images and text documents, such as PDFs, HTML, Word docs, and many more. Prior to 0.24.1, partition_html(html_parser_version="v2") and the VLM partitioner can preserve untrusted document tags, attributes, text, and link targets in metadata.text_as_html, while elements_to_html() emits the result as an HTML document. The to_html() path in unstructured/documents/ontology.py does not escape output or reject unsafe URL schemes, allowing event-handler attributes, attribute breakout markup, and javascript: links to survive parsing. When the generated HTML or text_as_html is rendered in a browser, attacker-controlled script can execute in the viewer's origin, including in document-ingestion workflows where a privileged reviewer opens submitted content. This issue is fixed in version 0.24.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unstructured-IO unstructured < 0.24.1 -

II. Public POCs for CVE-2026-104250

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III. Intelligence Information for CVE-2026-104250

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Patches & Fixes for CVE-2026-104250 (1)

Vendor Advisories for CVE-2026-104250 (1)

Vendor Pages for CVE-2026-104250 (1)

IV. Related Vulnerabilities

Same product: unstructured
Same vendor: Unstructured-IO
Same weakness: CWE-79

V. Comments for CVE-2026-104250

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