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Fix missing origin check in postMessage handler (CodeQL alert 546) #23063

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Merged
pelikhan merged 3 commits into from
Mar 26, 2026
Merged

Fix missing origin check in postMessage handler (CodeQL alert 546) #23063

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74bdfc9
Initial plan
Copilot Mar 26, 2026
8fef7f0
fix: add origin check in postMessage handler to resolve alert 546
Copilot Mar 26, 2026
83dff81
Merge branch 'main' into copilot/fix-code-scanning-alerts-546
pelikhan Mar 26, 2026
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6 changes: 6 additions & 0 deletions docs/public/wasm/compiler-worker.js
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,12 @@
* Handle incoming messages from the main thread.
*/
self.onmessage = async function (event) {
// Only accept messages from the same origin (or the dedicated-worker
// empty-string origin) to prevent cross-origin attacks.
if (event.origin && event.origin !== self.location.origin) {
return;
}

var msg = event.data;

if (msg.type !== 'compile') {
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