Technical Overview
A tax-management platform relied heavily on hiding administrative interface elements from lower-privileged accounts rather than enforcing authorization consistently on the server.
Testing demonstrated that restricted functionality could still be reached directly when the appropriate authorization checks were missing.
Separately, application fields accepted unsafe input that could be stored and subsequently rendered to privileged users, creating a stored cross-site scripting risk.
Impact
A combination of access-control weaknesses and stored XSS created a potential path from a lower-privileged account to administrative impact.
Recommendation
Enforce authorization server-side using role-based access controls, apply context-aware output encoding, validate uploaded content, and add automated authorization regression tests.
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