# CVE-2026-1181

## Summary

- **CVE ID:** CVE-2026-1181
- **Severity:** CRITICAL
- **CVSS Score:** 9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H)
- **CWE:** CWE-942, CWE-284
- **Published:** Jan 19, 2026
- **Last Modified:** Mar 12, 2026

## 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

- Altium — Altium 365 (unspecified)

## References

- [CNA](https://www.altium.com/platform/security-compliance/security-advisories)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._