MEDIUM6.1
GO-2026-4603
URLs in meta content attribute actions are not escaped in html/template
Quick fix
GO-2026-4603 — stdlib: upgrade to the fixed version with the command below.
go get stdlib@v1.25.8Details
Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh".
A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.
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