UNKNOWN Go
URLs in meta content attribute actions are not escaped in html/template
GO-2026-4603 · BIT-golang-2026-27142 · CVE-2026-27142
Published · Modified
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Description
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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