{"id":"CVE-2026-104250","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-104250","generatedAt":"2026-10-28T00:54:07.833Z","title":"The to_html() path in unstructured/documents/ontology.py does not escape output or reject unsafe URL schemes, allowing event-handler attributes, attribute breakout markup, and javascript: links to survive parsing.","description":"The unstructured library provides open-source components for ingesting and pre-processing images and text documents, such as PDFs, HTML, Word docs, and many more. Prior to 0.24.1, partition_html(html_parser_version=\"v2\") and the VLM partitioner can preserve untrusted document tags, attributes, text, and link targets in metadata.text_as_html, while elements_to_html() emits the result as an HTML document. The to_html() path in unstructured/documents/ontology.py does not escape output or reject unsafe URL schemes, allowing event-handler attributes, attribute breakout markup, and javascript: links to survive parsing. When the generated HTML or text_as_html is rendered in a browser, attacker-controlled script can execute in the viewer's origin, including in document-ingestion workflows where a privileged reviewer opens submitted content. This issue is fixed in version 0.24.1.","published":"2026-10-13T17:17:16.000Z","lastModified":"2026-10-16T16:00:34.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79","CWE-116"],"affected":[],"epss":{"score":0.00234,"percentile":0.14228,"date":"2026-10-26","history":[{"date":"2026-10-14","score":0.00194,"percentile":0.08435}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-13T17:17:16.000Z","detail":{"score":"6.1","severity":"MEDIUM","publishedAt":"2026-10-13T17:17:15.900Z"},"summary":"New CVE, medium severity (CVSS 6.1)."}],"references":[{"url":"https://github.com/Unstructured-IO/unstructured/commit/cda16b3f2170019be9c6ea5635946fb3eaa2d66f","source":"security-advisories@github.com"},{"url":"https://github.com/Unstructured-IO/unstructured/pull/4394","source":"security-advisories@github.com"},{"url":"https://github.com/Unstructured-IO/unstructured/releases/tag/0.24.1","source":"security-advisories@github.com"},{"url":"https://github.com/Unstructured-IO/unstructured/security/advisories/GHSA-v5mq-3xhg-98m9","source":"security-advisories@github.com"},{"url":"https://github.com/Unstructured-IO/unstructured/security/advisories/GHSA-v5mq-3xhg-98m9","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-104250","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}