{"answers":{"affected":"4 open source packages ship an affected version, including dompurify. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-0540 in the wild and no public exploit code.","fix":"Upgrade dompurify to a fixed version for your release line: 2.5.9 or 3.3.2.","what":"CVE-2026-0540 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 3 Mar 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-2026-0540 and fix it if it is affected.\n\nWhat it is: CVE-2026-0540 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 3 Mar 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: There is no known exploitation of CVE-2026-0540 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- dompurify (npm): affected from 2.5.3; fixed in 2.5.9\n- dompurify (npm): affected from 2.5.3; fixed in 2.5.9\n- dompurify (npm): affected from 3.1.3; fixed in 3.3.2\n- dompurify (npm): affected from 3.1.3; fixed in 3.3.2\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-2026-0540/ (Markdown: https://insights.sbomify.com/CVE-2026-0540/index.md)","id":"CVE-2026-0540","markdown":"https://insights.sbomify.com/CVE-2026-0540/index.md","name":"CVE-2026-0540","record":{"aliases":["CLEANSTART-2026-LL84916","CLEANSTART-2026-PI18727","DEBIAN-CVE-2026-0540","ECHO-c8de-3322-06e5","GHSA-v2wj-7wpq-c8vv","MINI-cj56-cg85-3fvm","MINI-cm65-jgp6-g8fj","MINI-h925-3f3w-w559","MINI-jhm9-788c-cfrw","MINI-phrg-f3gv-fc6r","MINI-q8mp-gmrj-9mrh","MINI-qrmr-8vf3-mh8f","MINI-rx4r-892w-9phv","MINI-vcq4-65w6-mqmv","ROOT-APP-NPM-CVE-2026-0540","UBUNTU-CVE-2026-0540","openSUSE-SU-2026:10599-1"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript sanitization library","requires_auth":"none","summary":"Attackers can execute arbitrary JavaScript by bypassing DOMPurify sanitization via missing rawtext elements in SAFE_FOR_XML mode.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"dompurify","vendor":"cure53"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"DOMPurify 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8, fixed in commit 2726c74, contain a cross-site scripting vulnerability that allows attackers to bypass attribute sanitization by exploiting five missing rawtext elements (noscript, xmp, noembed, noframes, iframe) in the SAFE_FOR_XML regex. Attackers can include payloads like \u003c/noscript\u003e\u003cimg src=x onerror=alert(1)\u003e in attribute values to execute JavaScript when sanitized output is placed inside these unprotected rawtext contexts.","ecosystems":["npm","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"DOMPurify XSS via Missing Rawtext Elements in SAFE_FOR_XML","id":"CVE-2026-0540","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":5,"n_references":5,"next":{"headline":"Privilege escalation in AXIS OS","id":"CVE-2026-0541"},"packages":[{"ecosystem":"npm","fixed":["2.5.9"],"introduced":["2.5.3"],"last_affected":[],"package":"dompurify","purl":null,"source":"GHSA-v2wj-7wpq-c8vv"},{"ecosystem":"npm","fixed":["2.5.9"],"introduced":["2.5.3"],"last_affected":[],"package":"dompurify","purl":"pkg:npm/dompurify","source":"GHSA-v2wj-7wpq-c8vv"},{"ecosystem":"npm","fixed":["3.3.2"],"introduced":["3.1.3"],"last_affected":[],"package":"dompurify","purl":null,"source":"GHSA-v2wj-7wpq-c8vv"},{"ecosystem":"npm","fixed":["3.3.2"],"introduced":["3.1.3"],"last_affected":[],"package":"dompurify","purl":"pkg:npm/dompurify","source":"GHSA-v2wj-7wpq-c8vv"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.2.30+git306.82d5aef5-1.1"],"introduced":["0"],"last_affected":[],"package":"cacti","purl":"pkg:rpm/opensuse/cacti\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10599-1"}],"prev":{"headline":"Local Privilege Escalation in pcvisit service client","id":"CVE-2026-0539"},"products":["DOMPurify"],"published":"2026-03-03","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":6.3,"headline":"DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside \u003ctemplate\u003e.content","id":"CVE-2026-49978","kev_date_added":null,"published":"2026-07-14"},{"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":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-25","vendors":["cure53"]},"summary":"Attackers can execute arbitrary JavaScript by bypassing DOMPurify sanitization via missing rawtext elements in SAFE_FOR_XML mode.","url":"https://insights.sbomify.com/CVE-2026-0540/"}