{"answers":{"affected":"2 open source packages ship an affected version, including dompurify. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49978 exists.","fix":"Upgrade dompurify to 3.4.7 or later.","what":"CVE-2026-49978 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 14 Jul 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-2026-49978 and fix it if it is affected.\n\nWhat it is: CVE-2026-49978 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 14 Jul 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-2026-49978 exists.\n\nAffected packages and fixed versions:\n- dompurify (npm): affected all versions; fixed in 3.4.7\n- dompurify (npm): affected all versions; fixed in 3.4.7\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-2026-49978/ (Markdown: https://insights.sbomify.com/CVE-2026-49978/index.md)","id":"CVE-2026-49978","markdown":"https://insights.sbomify.com/CVE-2026-49978/index.md","name":"CVE-2026-49978","record":{"aliases":["CLSA-2026-1793120038","DEBIAN-CVE-2026-49978","ECHO-63b6-6bde-ad17","GHSA-rp9w-3fw7-7cwq","MINI-236v-h394-f39q","MINI-7c53-5cwx-j26v","MINI-8xm4-5vx6-cp5h","MINI-97gc-jjrw-mmjg","MINI-jc3r-9hrx-g8rj","MINI-m29x-6h7m-g96m","MINI-mfqr-c5p7-8p5f","MINI-mg2f-9hm4-h7hm","MINI-mwm8-ccrg-442w","MINI-mxf7-8fqp-h27v","MINI-pcc9-wj65-qqcp","MINI-q23x-2qhf-jwq7","MINI-rp8x-rx4r-r999","MINI-w9q7-wr6f-jmmx","MINI-x4q9-57vj-r568","MINI-x7q4-j4jq-xj76","MINI-xqvw-8g3q-5q6g","ROOT-APP-NPM-CVE-2026-49978","UBUNTU-CVE-2026-49978"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript HTML sanitizer","requires_auth":"none","summary":"DOMPurify fails to sanitize shadow DOM content within templates, allowing attackers to inject malicious scripts that execute when the template is cloned.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"dompurify","vendor":"cure53"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside \u003ctemplate\u003e.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.","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":"DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside \u003ctemplate\u003e.content","id":"CVE-2026-49978","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Appsmith: SSRF via `POST /api/v1/admin/send-test-email` — JavaMail Bypasses WebClient IP Filter","id":"CVE-2026-49979"},"packages":[{"ecosystem":"npm","fixed":["3.4.7"],"introduced":["0"],"last_affected":[],"package":"dompurify","purl":null,"source":"GHSA-rp9w-3fw7-7cwq"},{"ecosystem":"npm","fixed":["3.4.7"],"introduced":["0"],"last_affected":[],"package":"dompurify","purl":"pkg:npm/dompurify","source":"GHSA-rp9w-3fw7-7cwq"}],"prev":{"headline":"tarteaucitron.js: data-cookie attribute can be used to delete arbitrary cookies","id":"CVE-2026-49977"},"products":["DOMPurify"],"published":"2026-07-14","related":[{"cvss_score":10,"headline":"DOMPurify nesting-based mXSS","id":"CVE-2024-47875","kev_date_added":null,"published":"2024-10-11"},{"cvss_score":9.1,"headline":"DOMPurify vulnerable to tampering by prototype polution","id":"CVE-2024-48910","kev_date_added":null,"published":"2024-10-31"},{"cvss_score":8.2,"headline":"DOMPurify XSS via `selectedcontent` re-clone","id":"CVE-2026-47423","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":7.3,"headline":"Tampering by prototype polution in DOMPurify","id":"CVE-2024-45801","kev_date_added":null,"published":"2024-09-16"},{"cvss_score":6.1,"headline":"DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks","id":"CVE-2026-49458","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":6.1,"headline":"DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM","id":"CVE-2026-49459","kev_date_added":null,"published":"2026-07-14"}],"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":"US public information, NVD API terms","name":"NVD"},{"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":"2026-07-21","vendors":["cure53"]},"summary":"DOMPurify fails to sanitize shadow DOM content within templates, allowing attackers to inject malicious scripts that execute when the template is cloned.","url":"https://insights.sbomify.com/CVE-2026-49978/"}