Vulnerability · Published Jan 19, 2026 · Assigned by Altium
CVE-2026-1181Altium 365 Over-Permissive CORS Configuration Allows Credentialed Cross-Origin Workspace Access
Critical 9.0
In plain English
A critical-severity improper access control in Altium 365 from Altium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official description
Altium 365 workspace endpoints were configured with an overly permissive Cross-Origin Resource Sharing (CORS) policy that allowed credentialed cross-origin requests from other Altium-controlled subdomains, including forum.live.altium.com. As a result, JavaScript executing on those origins could access authenticated workspace APIs in the context of a logged-in user. When chained with vulnerabilities in those external applications, this misconfiguration enables unauthorized access to workspace data, administrative actions, and bypass of IP allowlisting controls, including in GovCloud environments.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Altium | Altium 365 | unspecified |
Weakness: CWE-942, CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H