{"answers":{"affected":"13 open source packages ship an affected version, including typo3/cms, typo3 and typo3/cms-backend. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21340 in the wild and no public exploit code.","fix":"Upgrade typo3/cms to a fixed version for your release line: 10.4.14 or 11.1.1.","what":"CVE-2021-21340 is a medium-severity cross-site scripting vulnerability in Typo3 Typo3, published on 23 Mar 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-21340 and fix it if it is affected.\n\nWhat it is: CVE-2021-21340 is a medium-severity cross-site scripting vulnerability in Typo3 Typo3, published on 23 Mar 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-21340 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- typo3/cms (Packagist): affected from 10.0.0; fixed in 10.4.14\n- typo3/cms (Packagist): affected from 10.0.0; fixed in 10.4.14\n- typo3/cms (Packagist): affected from 11.0.0; fixed in 11.1.1\n- typo3/cms (Packagist): affected from 11.0.0; fixed in 11.1.1\n- typo3 (Bitnami): affected from 10.0.0; fixed in 10.4.14, 11.1.1\n- typo3/cms-backend (Packagist): affected from 10.0.0; fixed in 10.4.14\n- typo3/cms-backend (Packagist): affected from 10.0.0; fixed in 10.4.14\n- typo3/cms-backend (Packagist): affected from 11.0.0; fixed in 11.1.1\n- typo3/cms-backend (Packagist): affected from 11.0.0; fixed in 11.1.1\n- typo3/cms-core (Packagist): affected from 10.0.0; fixed in 10.4.14\n- typo3/cms-core (Packagist): affected from 10.0.0; fixed in 10.4.14\n- typo3/cms-core (Packagist): affected from 11.0.0; fixed in 11.1.1\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-2021-21340/ (Markdown: https://insights.sbomify.com/CVE-2021-21340/index.md)","id":"CVE-2021-21340","markdown":"https://insights.sbomify.com/CVE-2021-21340/index.md","name":"CVE-2021-21340","record":{"aliases":["BIT-typo3-2021-21340","GHSA-fjh3-g8gq-9q92"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"TYPO3 CMS","requires_auth":"low_privilege","summary":"Authenticated backend users can trigger cross-site scripting via database description fields during content preview in TYPO3.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"typo3","vendor":"typo3"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/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":"TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1 .","ecosystems":["Bitnami","Packagist"],"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":"Cross-Site Scripting in Content Preview","id":"CVE-2021-21340","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"typo3:typo3","products":["typo3:typo3"],"type":"xss","year":"2021"},"n_packages":13,"n_references":3,"next":{"headline":"XStream can cause a Denial of Service","id":"CVE-2021-21341"},"packages":[{"ecosystem":"Bitnami","fixed":["10.4.14","11.1.1"],"introduced":["10.0.0","11.0.0"],"last_affected":[],"package":"typo3","purl":"pkg:bitnami/typo3","source":"BIT-typo3-2021-21340"},{"ecosystem":"Packagist","fixed":["10.4.14"],"introduced":["10.0.0"],"last_affected":[],"package":"typo3/cms","purl":null,"source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["10.4.14"],"introduced":["10.0.0"],"last_affected":[],"package":"typo3/cms","purl":"pkg:composer/typo3/cms","source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["11.1.1"],"introduced":["11.0.0"],"last_affected":[],"package":"typo3/cms","purl":null,"source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["11.1.1"],"introduced":["11.0.0"],"last_affected":[],"package":"typo3/cms","purl":"pkg:composer/typo3/cms","source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["10.4.14"],"introduced":["10.0.0"],"last_affected":[],"package":"typo3/cms-backend","purl":null,"source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["10.4.14"],"introduced":["10.0.0"],"last_affected":[],"package":"typo3/cms-backend","purl":"pkg:composer/typo3/cms-backend","source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["11.1.1"],"introduced":["11.0.0"],"last_affected":[],"package":"typo3/cms-backend","purl":null,"source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["11.1.1"],"introduced":["11.0.0"],"last_affected":[],"package":"typo3/cms-backend","purl":"pkg:composer/typo3/cms-backend","source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["10.4.14"],"introduced":["10.0.0"],"last_affected":[],"package":"typo3/cms-core","purl":null,"source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["10.4.14"],"introduced":["10.0.0"],"last_affected":[],"package":"typo3/cms-core","purl":"pkg:composer/typo3/cms-core","source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["11.1.1"],"introduced":["11.0.0"],"last_affected":[],"package":"typo3/cms-core","purl":null,"source":"GHSA-fjh3-g8gq-9q92"},{"ecosystem":"Packagist","fixed":["11.1.1"],"introduced":["11.0.0"],"last_affected":[],"package":"typo3/cms-core","purl":"pkg:composer/typo3/cms-core","source":"GHSA-fjh3-g8gq-9q92"}],"prev":{"headline":"Cleartext storage of session identifier","id":"CVE-2021-21339"},"products":["TYPO3.CMS"],"published":"2021-03-23","related":[{"cvss_score":10,"headline":"Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection","id":"CVE-2009-0258","kev_date_added":null,"published":"2009-01-22"},{"cvss_score":9.8,"headline":"Typo3 SQL injection due to faulty prepared statements","id":"CVE-2011-3583","kev_date_added":null,"published":"2019-11-25"},{"cvss_score":9.8,"headline":"Typo3 Authentication Bypass","id":"CVE-2011-4628","kev_date_added":null,"published":"2019-11-06"},{"cvss_score":8.8,"headline":"Persisted Cross-Site Scripting in Frontend Rendering in typo3","id":"CVE-2023-24814","kev_date_added":null,"published":"2023-02-07"},{"cvss_score":8.8,"headline":"Cross-Site-Request-Forgery in Backend URI Handling in Typo3","id":"CVE-2021-41113","kev_date_added":null,"published":"2021-10-05"},{"cvss_score":8.8,"headline":"Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS","id":"CVE-2020-15098","kev_date_added":null,"published":"2020-07-29"},{"cvss_score":8.8,"headline":"Deserialization of Untrusted Data in TYPO3 CMS","id":"CVE-2020-11067","kev_date_added":null,"published":"2020-05-13"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["TYPO3"]},"summary":"Authenticated backend users can trigger cross-site scripting via database description fields during content preview in TYPO3.","url":"https://insights.sbomify.com/CVE-2021-21340/"}