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Content-Security-Policy: object-src directive

files/en-us/web/http/reference/headers/content-security-policy/object-src/index.md

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The HTTP {{HTTPHeader("Content-Security-Policy")}} object-src directive specifies valid sources for the {{HTMLElement("object")}} and {{HTMLElement("embed")}} elements.

[!NOTE] Elements controlled by object-src are perhaps coincidentally considered legacy HTML elements and aren't receiving new standardized features (such as the security attributes sandbox or allow for <iframe>). Therefore it is recommended to restrict this fetch-directive (e.g., explicitly set object-src 'none' if possible).

<table class="properties"> <tbody> <tr> <th scope="row">CSP version</th> <td>1</td> </tr> <tr> <th scope="row">Directive type</th> <td>{{Glossary("Fetch directive")}}</td> </tr> <tr> <th scope="row">{{CSP("default-src")}} fallback</th> <td> Yes. If this directive is absent, the user agent will look for the <code>default-src</code> directive. </td> </tr> </tbody> </table>

Syntax

http
Content-Security-Policy: object-src 'none';
Content-Security-Policy: object-src <source-expression-list>;

This directive may have one of the following values:

  • 'none'
    • : No resources of this type may be loaded. The single quotes are mandatory.
  • <source-expression-list>
    • : A space-separated list of source expression values. Resources of this type may be loaded if they match any of the given source expressions. For this directive, the following source expression values are applicable:

Examples

Violation cases

Given this CSP header:

http
Content-Security-Policy: object-src https://example.com/

The following {{HTMLElement("object")}} and {{HTMLElement("embed")}} elements are blocked and won't load:

html
<embed src="https://not-example.com/flash" />
<object data="https://not-example.com/plugin"></object>

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

  • {{HTTPHeader("Content-Security-Policy")}}
  • {{HTMLElement("object")}} and {{HTMLElement("embed")}}