{"answers":{"affected":"3 open source packages ship an affected version, including bleach. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-23980 exists.","fix":"Upgrade bleach to 3.3.0 or later.","what":"CVE-2021-23980 is a medium-severity cross-site scripting vulnerability in Mozilla Bleach, published on 16 Feb 2023. 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-2021-23980 and fix it if it is affected.\n\nWhat it is: CVE-2021-23980 is a medium-severity cross-site scripting vulnerability in Mozilla Bleach, published on 16 Feb 2023. 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-2021-23980 exists.\n\nAffected packages and fixed versions:\n- bleach (PyPI): affected all versions; fixed in 3.3.0\n- bleach (PyPI): affected all versions; fixed in 3.3.0\n- bleach (PyPI): affected all versions; fixed in 3.3.0\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-2021-23980/ (Markdown: https://insights.sbomify.com/CVE-2021-23980/index.md)","id":"CVE-2021-23980","markdown":"https://insights.sbomify.com/CVE-2021-23980/index.md","name":"CVE-2021-23980","record":{"aliases":["DEBIAN-CVE-2021-23980","DLA-2620-1","DSA-4892-1","GHSA-vv2x-vrpj-qqpq","MGASA-2021-0260","OESA-2022-1861","PYSEC-2021-865","UBUNTU-CVE-2021-23980"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"Python HTML sanitizer","requires_auth":"none","summary":"Mutation XSS in Bleach allows code execution when specific non-default tags and settings are used for HTML sanitization.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mozilla","cpe":[{"product":"bleach","vendor":"mozilla"}],"cvss":{"score":6.1,"severity":"medium","source":"cisa-adp","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":"A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe, or xmp in allowed tags the keyword argument strip_comments=False Note: none of the above tags are in the default allowed tags and strip_comments defaults to True.","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":"Cross-site scripting in Bleach","id":"CVE-2021-23980","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"xss","year":"2021"},"n_packages":3,"n_references":2,"next":{"headline":"Memory corruption in Firefox","id":"CVE-2021-23981"},"packages":[{"ecosystem":"PyPI","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"bleach","purl":null,"source":"GHSA-vv2x-vrpj-qqpq"},{"ecosystem":"PyPI","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"bleach","purl":"pkg:pypi/bleach","source":"GHSA-vv2x-vrpj-qqpq"},{"ecosystem":"PyPI","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"bleach","purl":"pkg:pypi/bleach","source":"PYSEC-2021-865"}],"prev":{"headline":"Memory corruption in Firefox","id":"CVE-2021-23979"},"products":["Mozilla Bleach"],"published":"2023-02-16","related":[{"cvss_score":9.8,"headline":"Bleach URI Scheme Restriction Bypass","id":"CVE-2018-7753","kev_date_added":null,"published":"2018-03-07"},{"cvss_score":7.5,"headline":"regular expression denial-of-service (ReDoS) in Bleach","id":"CVE-2020-6817","kev_date_added":null,"published":"2023-02-16"}],"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":"2025-03-19","vendors":["Mozilla"]},"summary":"Mutation XSS in Bleach allows code execution when specific non-default tags and settings are used for HTML sanitization.","url":"https://insights.sbomify.com/CVE-2021-23980/"}