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CVE-2026-1181

Altium 365 Over-Permissive CORS Configuration Allows Credentialed Cross-Origin Workspace Access

Published: Jan 19, 2026Updated: Jan 26, 2026 Sources: CVE List NVDCWE-284
NVD MITRE
9.0CVSSCRITICAL
EPSS Score
0.3%
Top 77.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-284CWE-942

Affected Products

Altium 365Altium
Mixed
DevTools & CI / build-test-tools
altiumcommercialAUDevTools & CI

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

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

Timeline

Published
Jan 19, 2026
Last Updated
Jan 26, 2026

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