CVE-2026-1009

critical · 9

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

0.2%

EPSS (exploit prob.)

16th

EPSS percentile

2026-01-15

Published

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Weaknesses

CWE-79CWE-284

Affected products

Vendor	Product	Affected versions
altium	altium_live	1.2.2

Check a specific version with /api/v1/cve/match.

References

https://www.altium.com/platform/security-compliance/security-advisories

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-1009