{"id":"CVE-2026-27142","state":"PUBLISHED","title":"URLs in meta content attribute actions are not escaped in html/template","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.","publishedAt":"2026-03-06T21:28:14.674Z","updatedAt":"2026-03-16T15:21:14.465Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"CISA-ADP"},"assigner":"Go","products":["Go standard library html/template"],"affected":[{"vendor":"Go standard library","product":"html/template","packageName":"html/template","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.25.8","versionType":"semver"},{"version":"1.26.0-0","status":"affected","lessThan":"1.26.1","versionType":"semver"}],"collectionURL":"https://pkg.go.dev","programRoutines":[{"name":"tTag"},{"name":"escaper.escapeAction"},{"name":"Template.Execute"},{"name":"Template.ExecuteTemplate"}]}],"references":["https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk","https://go.dev/issue/77954","https://go.dev/cl/752081","https://pkg.go.dev/vuln/GO-2026-4603"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27142.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27142","state":"PUBLISHED","datePublished":"2026-03-06T21:28:14.674Z","dateUpdated":"2026-03-16T15:21:14.465Z","assignerShortName":"Go","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateReserved":"2026-02-17T19:57:28.435Z"},"containers":{"cna":{"title":"URLs in meta content attribute actions are not escaped in html/template","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Go standard library","product":"html/template","packageName":"html/template","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.25.8","versionType":"semver"},{"version":"1.26.0-0","status":"affected","lessThan":"1.26.1","versionType":"semver"}],"collectionURL":"https://pkg.go.dev","programRoutines":[{"name":"tTag"},{"name":"escaper.escapeAction"},{"name":"Template.Execute"},{"name":"Template.ExecuteTemplate"}]}],"references":[{"url":"https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk"},{"url":"https://go.dev/issue/77954"},{"url":"https://go.dev/cl/752081"},{"url":"https://pkg.go.dev/vuln/GO-2026-4603"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}],"providerMetadata":{"shortName":"Go","orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateUpdated":"2026-03-06T21:28:14.674Z"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":6.1,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-16T15:21:11.058826Z","id":"CVE-2026-27142","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-16T15:21:14.465Z"}}]}}}