{"id":"CVE-2026-39826","state":"PUBLISHED","title":"Escaper bypass leads to XSS in html/template","description":"If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block.","publishedAt":"2026-05-07T19:41:19.138Z","updatedAt":"2026-05-08T14:05:05.849Z","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":"1.25.10","versionType":"semver"},{"version":"1.26.0-0","status":"affected","lessThan":"1.26.3","versionType":"semver"}],"collectionURL":"https://pkg.go.dev","programRoutines":[{"name":"isJSType"},{"name":"Template.Execute"},{"name":"Template.ExecuteTemplate"}]}],"references":["https://go.dev/issue/78981","https://go.dev/cl/771180","https://groups.google.com/g/golang-announce/c/qcCIEXso47M","https://pkg.go.dev/vuln/GO-2026-4980"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/39xxx/CVE-2026-39826.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39826","state":"PUBLISHED","datePublished":"2026-05-07T19:41:19.138Z","dateUpdated":"2026-05-08T14:05:05.849Z","assignerShortName":"Go","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateReserved":"2026-04-07T18:13:03.528Z"},"containers":{"cna":{"title":"Escaper bypass leads to XSS in html/template","descriptions":[{"lang":"en","value":"If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block."}],"affected":[{"vendor":"Go standard library","product":"html/template","packageName":"html/template","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.25.10","versionType":"semver"},{"version":"1.26.0-0","status":"affected","lessThan":"1.26.3","versionType":"semver"}],"collectionURL":"https://pkg.go.dev","programRoutines":[{"name":"isJSType"},{"name":"Template.Execute"},{"name":"Template.ExecuteTemplate"}]}],"references":[{"url":"https://go.dev/issue/78981"},{"url":"https://go.dev/cl/771180"},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"},{"url":"https://pkg.go.dev/vuln/GO-2026-4980"}],"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":"2026-05-07T19:41:19.138Z"},"credits":[{"lang":"en","value":"Mundur (https://github.com/M0nd0R)"}]},"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":"2026-05-08T14:04:40.842823Z","id":"CVE-2026-39826","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":"2026-05-08T14:05:05.849Z"}}]}}}