BIT-golang-2026-27142

vendorUSosv

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

view advisory published 2026-03-10Licence: per source

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-27142US	—	0.35% (27th)	—	2026-03-06
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"…

references

External citations — patches, advisories, analysis.

https://go.dev/cl/752081DISCUSSION
https://go.dev/issue/77954REPORT
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hkARTICLE
https://nvd.nist.gov/vuln/detail/CVE-2026-27142WEB
https://pkg.go.dev/vuln/GO-2026-4603ADVISORY

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