{"cve":"CVE-2026-39823","nvd":{"published":"2026-05-07T20:16:43.290","modified":"2026-10-26T20:10:00.160","status":"Analyzed","description":"CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.","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/769920","https://go.dev/issue/78913","https://groups.google.com/g/golang-announce/c/qcCIEXso47M","https://pkg.go.dev/vuln/GO-2026-4982"],"products":["golang:go"],"source":"nvd","synced_at":"2026-10-26T20:34:58.897451322+00:00"},"epss":{"cve":"CVE-2026-39823","score":0.00314,"percentile":0.24138,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GO-2026-4982","url":"https://osv.dev/vulnerability/GO-2026-4982","summary":"Bypass of meta content URL escaping causes XSS in html/template","modified":"2026-08-31T10:25:58.456781741Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.25.10",">=1.26.0-0 <1.26.3"],"fixed":["1.25.10","1.26.3"]}]}],"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."]}