Helpdesk Platform Hardens File Downloads After Unverified XSS Bug Report

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A security researcher named Dhruv reported a potential stored XSS vulnerability in a helpdesk product, claiming a PDF with embedded JavaScript could execute when opened by a support agent. The development team investigated and found the exact attack path likely could not be reproduced, given existing safeguards including forced attachment headers and Blob-based downloads. However, the team identified a real gap: files were validated at upload time but their MIME types were trusted from the database rather than re-checked at download. To close this, the team added runtime MIME detection at download time, ensuring only allow-listed image types are served inline while all other files, including PDFs, are forced as attachments with strict Content-Security-Policy and nosniff headers. Four new tests were written and the fix was shipped to production the same day the gap was identified.

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ProgrammingDEV Community ·

How to Connect to an Azure Virtual Machine Using SSH

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