docs: document opt-in safeUrlSchemes configuration parameter (CP: 23)#5793
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docs: document opt-in safeUrlSchemes configuration parameter (CP: 23)#5793mcollovati wants to merge 1 commit into
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Flow adds URL scheme validation for `Anchor.setHref()`, `IFrame.setSrc()` and `Page.open()`, but the validation is opt-in: URLs of any scheme are accepted unless the `safeUrlSchemes` parameter is set. Document the `safeUrlSchemes` parameter and the Unsafe URL Schemes security topic, and note that the default flips to enabled in Vaadin 25.2 so users are aware of the change when migrating. Part of vaadin/flow#24924
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Backport of #5775 to the
v23branch.As on the newer backports (#5790, #5791, #5792), the URL scheme validation is opt-in (disabled by default): the
safeUrlSchemesparameter defaults to*, so every scheme is accepted unless the parameter is set. There is nocom.vaadin.safeUrlSchemeslegacy name.Adapted to the
v23documentation layout (articles/configuration/properties.asciidocthree-column table;articles/security/advanced-topics/vulnerabilities.asciidocfor the Unsafe URL Schemes topic, plain code spans). A note points out that the default flips to enabled in Vaadin 25.2 so users are aware of the behavior change when migrating.Part of vaadin/flow#24924
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