WW-5623 fix(core): HTML-encode form action in PostbackResult to prevent XSS#1701
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lukaszlenart merged 1 commit intoMay 25, 2026
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…nt XSS PostbackResult.doExecute() embeds finalLocation into a <form action=""> attribute via raw string concatenation. A double quote in the location breaks out of the attribute, enabling reflected XSS. The response Content-Type is text/html. Form field names and values elsewhere in the same class are properly URL-encoded via URLEncoder.encode(); the action attribute was not encoded at all. Wrap finalLocation with StringEscapeUtils.escapeHtml4() before embedding it in the form tag, consistent with the encoding approach used in DefaultActionProxy, Property, and TextProviderHelper. Adds three regression tests in PostbackResultTest: - testFormActionHtmlEscaping: XSS payload with attribute breakout - testFormActionEscapesAllHtmlSpecialChars: covers ", &, <, > - testFormActionCleanLocationUnchanged: regression for clean URLs
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Just one important remarkThis PR doesn't address a vulnerability, it's pure framework hardening. The potential attack vector assumes a developer uses a raw user input in OGNL expression evaluation which is against our guideline: |
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Backports #1653 to the 6.x line.
PostbackResult.doExecute()embedsfinalLocationinto a<form action="">attribute via raw string concatenation. Wrap it withStringEscapeUtils.escapeHtml4(), consistent with the encoding approach used inDefaultActionProxy,Property, andTextProviderHelper.See #1653 for the full analysis.
Adds three regression tests covering the XSS payload, all special characters, and the clean-URL regression case.
Fixes WW-5623.