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¿Es una amenaza grave? ¿Qué hacer para evitarla?
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La siguiente cita de seguridad de Google explica este problema:
Unfortunately, we believe that this class of attacks is inherent to the current design of web browsers and can't be meaningfully mitigated by any single website; in particular, clobbering the window. opener property limits one of the vectors but still makes it easy to exploit the remaining ones.