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CVE-2026-1009— Stored Cross-Site Scripting in Altium Live Forum Leading to Cross-Customer Data Exposure

CVSS 9.0 · Critical EPSS 0.02% · P5
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I. Basic Information for CVE-2026-1009

Vulnerability Information
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Vulnerability Title
Stored Cross-Site Scripting in Altium Live Forum Leading to Cross-Customer Data Exposure
Source: NVD (National Vulnerability Database)
Vulnerability Description
A stored cross-site scripting (XSS) vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post. Successful exploitation allows the attacker’s payload to execute in the context of the victim’s authenticated Altium 365 session, enabling unauthorized access to workspace data, including design files and workspace settings. Exploitation requires user interaction to view a malicious forum post.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
Altium 365 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Altium 365是美国Altium公司的一个产品设计和开发平台。 Altium 365存在安全漏洞，该漏洞源于论坛帖子内容缺少服务器端输入清理，可能导致存储型跨站脚本攻击。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
AltiumAltium Live 0 ~ 1.2.2 -

II. Public POCs for CVE-2026-1009

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III. Intelligence Information for CVE-2026-1009

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Same Patch Batch · Altium · 2026-01-15 · 4 CVEs total

CVE-2026-10108.0 HIGHStored Cross-Site Scripting in Altium Enterprise Server Workflow Engine Allows Privilege E
CVE-2026-10087.6 HIGHStored Cross-Site Scripting in Altium Live User Profile Fields
CVE-2026-10116.1 MEDIUMStored Cross-Site Scripting in Altium Live Support Center Comment Endpoint

IV. Related Vulnerabilities

Same product: Altium Live
Same vendor: Altium
Same weakness: CWE-79

V. Comments for CVE-2026-1009

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