Critical · published January 19, 2026
🚨 Altium 365 has an overly chatty CORS policy that lets JavaScript from other Altium subdomains waltz right into your workspace APIs! 🔥 Think of it like a VIP party where any guest from the same venue can freely access the restricted lounge—even if they're not on the guest list. That openness can lead to some uninvited guests causing a ruckus behind the scenes! An attacker could exploit this misconfiguration to access sensitive workspace data as if they are a trusted user. This breach could allow unauthorized administrative actions, putting your entire workspace at risk and violating IP allowlisting controls, even in secure environments like GovCloud.
Think of it like a VIP party where any guest from the same venue can freely access the restricted lounge—even if they're not on the guest list. That openness can lead to some uninvited guests causing a ruckus behind the scenes! This vulnerability arises from a misconfigured Cross-Origin Resource Sharing (CORS) policy that permits credentialed requests from Altium-controlled subdomains, enabling JavaScript from those origins to interact with authenticated APIs incorrectly.
An attacker could exploit this misconfiguration to access sensitive workspace data as if they are a trusted user. This breach could allow unauthorized administrative actions, putting your entire workspace at risk and violating IP allowlisting controls, even in secure environments like GovCloud. Update the CORS policy to restrict access only to trusted origins. Review and tighten permissions on your workspace APIs to safeguard sensitive data. Regularly audit any external applications that could potentially chain with this vulnerability. You've got this! With these steps, you can secure your workspace in no time! 🛡️