disable external entity resolution in text_xml writeTo#204
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Signed-off-by: mohammed arib <arib@bugqore.com>
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the identity transform in text_xml.writeTo parses the supplied DataSource/Source without disabling external entities, so writing a text/xml part whose content comes from untrusted xml resolves SYSTEM entities and leaks local file contents (or reaches internal urls) into the output; disable secure-processing plus external DTD/stylesheet access on the TransformerFactory so the source is copied without fetching external resources.