Altium Live
CVE-2026-1009
CRITICAL
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Altium Forum has stored XSS in forum posts with scope change (CVSS 9.0). Authenticated attackers can inject JavaScript that executes in other users' sessions, including accessing Altium design tools and project data.
Technical ContextAI
Forum post content is not server-side sanitized (CWE-79). Injected JavaScript executes in authenticated user sessions. Altium users work with proprietary PCB designs and hardware IP.
RemediationAI
Implement server-side HTML sanitization on all forum content. Add CSP headers.
More in Altium Live
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Stored XSS in Altium Live's Support Center AddComment endpoint allows attackers to inject malicious JavaScript that pers
Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today