CVE-2026-1181

9.0 criticalEPSS 0.4%

Critical (9.0). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.0 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-31)
CWEs: CWE-284, CWE-942
Published: 2026-01-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

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

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