{"answers":{"affected":"3 open source packages ship an affected version, including lxml-html-clean. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28348 exists.","fix":"Upgrade lxml-html-clean to 0.4.4 or later.","what":"CVE-2026-28348 is a medium-severity cross-site scripting vulnerability in fedora-python lxml_html_clean, published on 5 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-2026-28348 and fix it if it is affected.\n\nWhat it is: CVE-2026-28348 is a medium-severity cross-site scripting vulnerability in fedora-python lxml_html_clean, published on 5 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28348 exists.\n\nAffected packages and fixed versions:\n- lxml-html-clean (PyPI): affected all versions; fixed in 0.4.4\n- lxml-html-clean (PyPI): affected all versions; fixed in 0.4.4\n- lxml-html-clean (PyPI): affected all versions; fixed in 0.4.4\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-2026-28348/ (Markdown: https://insights.sbomify.com/CVE-2026-28348/index.md)","id":"CVE-2026-28348","markdown":"https://insights.sbomify.com/CVE-2026-28348/index.md","name":"CVE-2026-28348","record":{"aliases":["DEBIAN-CVE-2026-28348","GHSA-hw26-mmpg-fqfg","MINI-qr5v-rg5q-mqwq","PYSEC-2026-2201","UBUNTU-CVE-2026-28348"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Python HTML cleaning library","requires_auth":"none","summary":"Attackers can bypass CSS filters using Unicode escapes to inject malicious scripts, leading to XSS in older browsers.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"lxml_html_clean","vendor":"fedoralovespython"}],"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-116","name":"Improper Encoding or Escaping of Output"}],"description":"lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes","id":"CVE-2026-28348","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"lxml_html_clean: \u003cbase\u003e tag injection through default Cleaner configuration","id":"CVE-2026-28350"},"packages":[{"ecosystem":"PyPI","fixed":["0.4.4"],"introduced":["0"],"last_affected":[],"package":"lxml-html-clean","purl":null,"source":"GHSA-hw26-mmpg-fqfg"},{"ecosystem":"PyPI","fixed":["0.4.4"],"introduced":["0"],"last_affected":[],"package":"lxml-html-clean","purl":"pkg:pypi/lxml-html-clean","source":"GHSA-hw26-mmpg-fqfg"},{"ecosystem":"PyPI","fixed":["0.4.4"],"introduced":["0"],"last_affected":[],"package":"lxml-html-clean","purl":"pkg:pypi/lxml-html-clean","source":"PYSEC-2026-2201"}],"prev":{"headline":"CKEditor: Cross-site scripting (XSS) in the HTML Support package","id":"CVE-2026-28343"},"products":["lxml_html_clean"],"published":"2026-03-05","related":[{"cvss_score":7.7,"headline":"HTML Cleaner allows crafted scripts in special contexts like svg or math to pass through","id":"CVE-2024-52595","kev_date_added":null,"published":"2024-11-19"},{"cvss_score":6.1,"headline":"lxml_html_clean: \u003cbase\u003e tag injection through default Cleaner configuration","id":"CVE-2026-28350","kev_date_added":null,"published":"2026-03-05"}],"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":"PyPA Advisory Database","prefix":"PYSEC"},{"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":"2026-03-06","vendors":["fedora-python"]},"summary":"Attackers can bypass CSS filters using Unicode escapes to inject malicious scripts, leading to XSS in older browsers.","url":"https://insights.sbomify.com/CVE-2026-28348/"}