CVE-2026-1181
Critical · 9.0CVSS
9.0
EPSS
0.4%
Published
Jan 19, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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