CVE-2026-1011 Stored Cross-Site Scripting in Altium Live Support Center Comment Endpoint
Attackers can inject malicious scripts into support comments, executing code in victims' browsers, including privileged support staff.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-1011?
CVE-2026-1011 is a medium-severity cross-site scripting vulnerability in Altium Live, published on 15 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-1011?
It affects 1 product.
Products include Altium Altium Live.
How do I fix CVE-2026-1011?
No fix has been published for CVE-2026-1011 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-1011 being exploited?
There is no known exploitation of CVE-2026-1011 in the wild and no public exploit code.
Other vulnerabilities in Altium Live
Sources
Also known as GHSA-vrmv-j3x6-c7mm.