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[modules | survey_accounts] Backport (to 26.0-release) GHSA-776p-5pwh-vc8p security fix - #11276
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What was wrong
The ValidateEmailSubmitInput.php endpoint returned JSON-encoded responses without explicitly setting the Content-Type header, potentially allowing browsers to interpret the response as HTML and resulting in XSS.
What changed
Added the following header after the permission check:
Content-Type: application/json; charset=utf-8Reference
Backport of the upstream security fix addressing GHSA-776p-5pwh-vc8p.
This change is submitted specifically as a security backport to the 26.0-release branch.