User agent-dependent response
Summary: PortSwigger Research notes that application responses may depend systematically on the User-Agent header, a behavior that is not itself a vulnerability but can expose additional attack surface. The text says mobile interfaces are often less thoroughly tested for issues such as cross-site scripting and often use simpler authentication and session handling than the full interface.
Bottom line: A mobile view served to a different User-Agent can carry weaker authentication and session handling than the desktop interface your team tested, so the surface you assessed may not be the one an attacker reaches.
Read the original at PortSwigger Research ↗
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