{"answers":{"affected":"2 open source packages ship an affected version, including sanitize-html.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63670 exists.","fix":"Upgrade sanitize-html to 2.17.6 or later.","what":"CVE-2026-63670 is a medium-severity cross-site scripting vulnerability in apostrophecms apostrophe, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-63670 and fix it if it is affected.\n\nWhat it is: CVE-2026-63670 is a medium-severity cross-site scripting vulnerability in apostrophecms apostrophe, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63670 exists.\n\nAffected packages and fixed versions:\n- sanitize-html (npm): affected all versions; fixed in 2.17.6\n- sanitize-html (npm): affected all versions; fixed in 2.17.6\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-63670/ (Markdown: https://insights.sbomify.com/CVE-2026-63670/index.md)","id":"CVE-2026-63670","markdown":"https://insights.sbomify.com/CVE-2026-63670/index.md","name":"CVE-2026-63670","record":{"aliases":["CLEANSTART-2026-VM49964","ECHO-baad-3a65-8f72","GHSA-jxwj-j7wr-gfrw","MINI-73qr-3p6g-qvrf","MINI-82jq-xgc6-v68c","MINI-j45c-q2wx-6jxx"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"ApostropheCMS","requires_auth":"none","summary":"Attackers can execute arbitrary JavaScript in victim browsers by bypassing HTML sanitization via malformed textarea tags in ApostropheCMS.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"ApostropheCMS is an open-source Node.js content management system. Prior to 2.17.6, sanitizeHtml() can pass disallowed executable markup through packages/sanitize-html/index.js when textarea or xmp is included in allowedTags because a literal solidus after the raw-text end-tag name is treated as text by htmlparser2 and the ontext handler emits that content without escaping, while a browser parses the following img onerror markup as active HTML. This issue is fixed in version 2.17.6.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `\u003c/textarea/\u003e` solidus close","id":"CVE-2026-63670","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"@nuxtjs/mdc's URL sanitizer misses SVG xlink:href and data:text/html, allowing XSS from untrusted markdown at the default configuration","id":"CVE-2026-63671"},"packages":[{"ecosystem":"npm","fixed":["2.17.6"],"introduced":["0"],"last_affected":[],"package":"sanitize-html","purl":null,"source":"GHSA-jxwj-j7wr-gfrw"},{"ecosystem":"npm","fixed":["2.17.6"],"introduced":["0"],"last_affected":[],"package":"sanitize-html","purl":"pkg:npm/sanitize-html","source":"GHSA-jxwj-j7wr-gfrw"}],"prev":{"headline":"ApostropheCMS: Missing destination-parent authorization in page `move()` allows a low-privileged editor to move and re-rank pages inside a restricted subtree","id":"CVE-2026-63669"},"products":["apostrophe"],"published":"2026-08-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-18","vendors":["apostrophecms"]},"summary":"Attackers can execute arbitrary JavaScript in victim browsers by bypassing HTML sanitization via malformed textarea tags in ApostropheCMS.","url":"https://insights.sbomify.com/CVE-2026-63670/"}