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The SPUri value shown in the signature details dialog is read directly from the signature XML inside a container, which is untrusted input. The addItem(..., const QUrl&) overload rendered it as a button whose click handler called QDesktopServices::openUrl() with no scheme validation, so a crafted container could set SPURI to file://, smb:// or a custom scheme and have the client invoke the matching OS handler on click. Only render a clickable button for http/https URLs; show any other or invalid scheme as plain, non-clickable text. The Signature method row uses the same overload and is hardened too.
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Only render a clickable button for http/https URLs; show any other or invalid scheme as plain, non-clickable text.