CVE-2026-1181 — Altium 365 Over-Permissive CORS Configuration Allows Credentialed Cross-Origin Workspace Access

Description (CNA)

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 (CNA)

Vendor / product	Versions
Altium / Altium 365	affected unspecified

CWE

CWE-942, CWE-284

References

https://www.altium.com/platform/security-compliance/security-advisories

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.