The get-page RPC command did not validate that the requested page-id was within the share-link's authorized :pages set, allowing share-link holders to read out-of-scope pages. The get-file-fragment command had the same issue.
This fix adds page scope validation to get-page, rejecting requests for pages not in the share-link's :pages set with a :not-found error. For get-file-fragment, share-link access is denied entirely as fragments lack direct page-id mapping.
The fix aligns these commands with the existing correct behavior in get-view-only-bundle, which already filters pages based on share-link scope.
Closes#11281
AI-assisted-by: qwen3.7-plus
52573be074