What is CVE-2026-1009?

CVE-2026-1009 is a critical-severity vulnerability in Altium Live, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-01-15.

How severe is CVE-2026-1009?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Altium Live

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 a…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Altium Live — versions 0
Altium Altium_live — versions 1.2.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-284 — Improper Access Control

References

4760f414-e1ae-4ff1-bdad-c7a9c3538b79 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-1009?: CVE-2026-1009 is a critical-severity vulnerability in Altium Live, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-01-15.
How severe is CVE-2026-1009?: Critical severity. CVSS v3 base score is 9.0 out of 10.