[Backport 21.2.X] fix(core): reject dynamic script host elements - #69569
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The previous fix for GHSA-692r-grfm-v8x7 was incomplete because it rejected script tags only when locating an explicit host element. Dynamic component instantiation can also infer the host element from the component selector. Move the script-host rejection to the point where ComponentFactory has resolved the host element for either path, so createComponent rejects script hosts consistently. (cherry picked from commit 135f375)
alan-agius4
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Jun 30, 2026
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Backport of #69551