{"cve":"CVE-2026-27142","nvd":{"published":"2026-03-06T22:16:01.177","modified":"2026-06-17T10:26:44.670","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["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"],"products":["golang:go"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-27142","score":0.00341,"percentile":0.27627,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GO-2026-4603","url":"https://osv.dev/vulnerability/GO-2026-4603","summary":"URLs in meta content attribute actions are not escaped in html/template","modified":"2026-05-15T10:59:23.946663160Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.25.8",">=1.26.0-0 <1.26.1"],"fixed":["1.25.8","1.26.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}