Summary
Unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of event.url.searchParams inside a server load function. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL.
Details
SvelteKit tracks which parameters in event.url.searchParams are read inside server load functions. If the application iterates over the these parameters, the uses.search_params array included in the boot script (embedded in the server-rendered HTML) will have any search param name included in unsanitized form.
packages/kit/src/runtime/server/utils.js:150 has the stringify_uses(node) function which prints these out.
Reproduction
In a +page.server.js or +layout.server.js:
/** @type {import('@sveltejs/kit').Load} */
export function load(event) {
const values = {};
for (const key of event.url.searchParams.keys()) {
values[key] = event.url.searchParams.get(key);
}
}If a user visits the page in question via a link containing ?</script/><script>window.pwned%3D1</script/>, the </script> will be included verbatim in the payload, causing the embedded script to be executed.
It is not necessary to return the parameter value from load or render it in the page, only to read it (which causes it to be tracked as a dependency) while load is running.
Impact
Any application that iterates over all values in event.url.searchParams in a load function in +page.server.js or +layout.server.js (directly or indirectly) is vulnerable to XSS.
References
kkarikos Reporter
Rich-Harris Remediation developer
dominikg Remediation reviewer
dummdidumm Remediation reviewer
Summary
Unsanitized search param names cause XSS vulnerability. You are affected if you iterate over all entries of
event.url.searchParamsinside a serverloadfunction. Attackers can exploit it by crafting a malicious URL and getting a user to click a link with said URL.Details
SvelteKit tracks which parameters in
event.url.searchParamsare read inside serverloadfunctions. If the application iterates over the these parameters, theuses.search_paramsarray included in the boot script (embedded in the server-rendered HTML) will have any search param name included in unsanitized form.packages/kit/src/runtime/server/utils.js:150has thestringify_uses(node)function which prints these out.Reproduction
In a
+page.server.jsor+layout.server.js:If a user visits the page in question via a link containing
?</script/><script>window.pwned%3D1</script/>, the</script>will be included verbatim in the payload, causing the embedded script to be executed.It is not necessary to return the parameter value from
loador render it in the page, only to read it (which causes it to be tracked as a dependency) whileloadis running.Impact
Any application that iterates over all values in
event.url.searchParamsin aloadfunction in+page.server.jsor+layout.server.js(directly or indirectly) is vulnerable to XSS.References