Weakness (CWE)
CWE-1022: Use of Web Link to Untrusted Target with window.opener Access
The web application produces links to untrusted external sites outside of its sphere of control, but it does not properly prevent the external site from modifying security-critical properties of the window.opener object, such as the location property.
How to prevent it (3 mitigations)
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Architecture and Design
Specify in the design that any linked external document must not be granted access to the location object of the calling page.
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Implementation
When creating a link to an external document using the <a> tag with a defined target, for example "_blank" or a named frame, provide the rel attribute with a value "noopener noreferrer".
If opening the external document in a new window via javascript, then reset the opener by setting it equal to null.
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Implementation
Do not use "_blank" targets. However, this can affect the usability of the application.
Source: MITRE CWE-1022
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