CVE-2026-1181 Altium 365 Over-Permissive CORS Configuration Allows Credentialed Cross-Origin Workspace Access
Overly permissive CORS settings allow cross-origin access to authenticated workspace APIs, enabling data theft and control bypass.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-1181?
CVE-2026-1181 is a critical vulnerability in Altium 365, published on 19 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-1181?
How do I fix CVE-2026-1181?
No fix has been published for CVE-2026-1181 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-1181 being exploited?
There is no known exploitation of CVE-2026-1181 in the wild and no public exploit code.
Sources
Also known as GHSA-pfq7-53pj-q6wc.