{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8630","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-05-14T18:57:10.898Z","datePublished":"2026-08-23T13:34:14.556Z","dateUpdated":"2026-08-23T13:34:14.556Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-08-23T13:34:14.556Z"},"datePublic":"2026-03-18T00:00:00.000Z","title":"justhtml before 1.12.0 Mutation XSS via Raw Text Elements","descriptions":[{"lang":"en","value":"justhtml before 1.12.0 (versions <= 1.11.0) contains a mutation cross-site scripting (mXSS) vulnerability in the serialization of raw-text elements such as <style> and <script>. When a DOM tree is processed by sanitize_dom() using a custom policy that keeps these elements, text nodes inside them are serialized literally without escaping, allowing attacker-controlled text containing the matching closing tag sequence to break out of the raw-text context and inject arbitrary HTML into the serialized output. The default sanitization policy is not affected because it drops the contents of style and script."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","cweId":"CWE-79","type":"CWE"}]}],"affected":[{"vendor":"EmilStenstrom","product":"justhtml","defaultStatus":"unaffected","packageURL":"pkg:pypi/justhtml","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"1.12.0"},{"version":"1.12.0","status":"unaffected","versionType":"semver"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"format":"CVSS"}],"references":[{"url":"https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-qvc2-mg72-jjhx","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-qvc2-mg72-jjhx)"},{"name":"VulnCheck Advisory: justhtml before 1.12.0 Mutation XSS via Raw Text Elements","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/justhtml-before-mutation-xss-via-raw-text-elements"}],"credits":[{"lang":"en","value":"offset","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}}}}