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I found out that an endpoint of a website may be vulnerable to XXE. It is using Unmarshal as an XML parser. When I try to send a post request using common XXE payloads, I receive the following response from the server:

[org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 54; DOCTYPE is disallowed when the feature \"http://apache.org/xml/features/disallow-doctype-decl\" set to true.]

Is there any payload that doesn't need the doctype declaration? Is it possible to exploit this XXE or not?

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