CVE-2026-1011mediumCWE-116CWE-79

CVE-2026-1011: medium-severity vulnerability in Altium Live

Stored Cross-Site Scripting in Altium Live Support Center Comment Endpoint

Published · Updated

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.1epss 0.3%
A stored cross-site scripting (XSS) vulnerability exists in the Altium Support Center AddComment endpoint due to missing server-side input sanitization. Although the client interface applies HTML escaping, the backend accepts and stores arbitrary HTML and JavaScript supplied via modified POST requests. The injected content is rendered verbatim when support cases are viewed by other users, including support staff with elevated privileges, allowing execution of arbitrary JavaScript in the victim’s browser context.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Altium · Altium Live
Related CVEs — Altium Live

In the same product, most dangerous first.

CVE-2026-1009CRITICALStored Cross-Site Scripting in Altium Live Forum Leading to Cross-Customer Data ExposureEPSS 0.2%CVE-2026-1008HIGHStored Cross-Site Scripting in Altium Live User Profile FieldsEPSS 0.2%