CVE-2026-1009

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.

CVSS v3 9.0 CRITICAL

9.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.3 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://www.altium.com/platform/security-compliance/security-advisories	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:altium:altium_live:1.2.2:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-01-15 23:15

Updated : 2026-01-23 19:32

NVD link : CVE-2026-1009

Mitre link : CVE-2026-1009

CVE.ORG link : CVE-2026-1009

JSON object : View

Products Affected

altium

altium_live

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-284

Improper Access Control

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