Fix code scanning alert no. 237: URL redirection from remote source #513
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Fixes https://github.com/grandnode/grandnode2/security/code-scanning/237
To fix the problem, we need to ensure that the
returnUrlis validated properly before using it in a redirect. Specifically, we should:returnUrlis a local URL usingUrl.IsLocalUrl(returnUrl).This ensures that the redirection is always to a safe and known URL, preventing open redirection attacks.
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