CVE-2026-27142

URLs in meta content attribute actions are not escaped in html/template

CVSS 6.1 MEDIUMEPSS 0.3%

Vexday Risk Score

13Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

CVSS 6.1EPSS 0.3%KEV nãoPoC —Patch —

Ciclo de vida

06 mar 2026Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Produtos afetados

Go standard library · html/template

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Referências

https://go.dev/cl/752081 https://go.dev/issue/77954 https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk https://pkg.go.dev/vuln/GO-2026-4603