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Security: Reflected XSS

Reported by tthe.dol...@gmail.com, Sep 22

Issue description

POC: https://chromium-try-flakes-staging.appspot.com/search?q=%3Cimg%20src%3DX%20onerror%3Dalert(document.domain)%3E

Source:
infra/appengine/chromium_try_flakes/handlers/search.py
line 29:
self.response.write('No flake entry found for ' + search)

"search" needs to be escaped.
 

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