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Support Center Issue Definitions Cross-origin resource sharing: all subdomains trusted

Cross-origin resource sharing: all subdomains trusted

Description

An HTML5 cross-origin resource sharing (CORS) policy controls whether and how content running on other domains can perform two-way interaction with the domain that publishes the policy. The policy is fine-grained and can apply access controls per-request based on the URL and other features of the request.

If an application allows interaction from all subdomains, then this significantly increases its attack surface. For example, a cross-site scripting (XSS) vulnerability in any subdomain could potentially compromise the application that publishes the policy. Some consumer ISPs return custom content when requests are made to unregistered subdomains, which can introduce XSS vulnerabilities even if all of an organization's own applications are secure.

Remediation

Rather than trusting all subdomains, use a whitelisted of trusted subdomains.

References

Vulnerability classifications

Typical severity

Low

Type index

0x00200603

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