{"answers":{"affected":"2 open source packages ship an affected version, including baserproject/basercms. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-20683 in the wild and no public exploit code.","fix":"Upgrade baserproject/basercms to 4.4.5 or later.","what":"CVE-2021-20683 is a medium-severity cross-site scripting vulnerability in Basercms Basercms, published on 26 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-2021-20683 and fix it if it is affected.\n\nWhat it is: CVE-2021-20683 is a medium-severity cross-site scripting vulnerability in Basercms Basercms, published on 26 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-2021-20683 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- baserproject/basercms (Packagist): affected all versions; fixed in 4.4.5\n- baserproject/basercms (Packagist): affected all versions; fixed in 4.4.5\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-2021-20683/ (Markdown: https://insights.sbomify.com/CVE-2021-20683/index.md)","id":"CVE-2021-20683","markdown":"https://insights.sbomify.com/CVE-2021-20683/index.md","name":"CVE-2021-20683","record":{"aliases":["GHSA-v9w8-hq92-v39m"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"baserCMS","requires_auth":"low_privilege","summary":"Remote authenticated attackers can inject arbitrary scripts into blog articles, potentially leading to code execution or account takeover.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"basercms","vendor":"basercms"}],"cvss":{"score":5.4,"severity":"medium","source":"nvd","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":"Improper neutralization of JavaScript input in the blog article editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.","ecosystems":["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 (XSS) in baserCMS","id":"CVE-2021-20683","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"basercms:basercms","products":["basercms:basercms"],"type":"xss","year":"2021"},"n_packages":2,"n_references":2,"next":{"headline":"Cross-site scripting in MagazinegerZ","id":"CVE-2021-20684"},"packages":[{"ecosystem":"Packagist","fixed":["4.4.5"],"introduced":["0"],"last_affected":[],"package":"baserproject/basercms","purl":null,"source":"GHSA-v9w8-hq92-v39m"},{"ecosystem":"Packagist","fixed":["4.4.5"],"introduced":["0"],"last_affected":[],"package":"baserproject/basercms","purl":"pkg:composer/baserproject/basercms","source":"GHSA-v9w8-hq92-v39m"}],"prev":{"headline":"OS Command Injection in baserCMS","id":"CVE-2021-20682"},"products":["baserCMS"],"published":"2021-03-26","related":[{"cvss_score":9.8,"headline":"baserCMS File Uploader Remote Code Execution (RCE) vulnerability","id":"CVE-2023-25654","kev_date_added":null,"published":"2023-03-23"},{"cvss_score":9.8,"headline":"baserCMS allows any file to be uploaded","id":"CVE-2023-25655","kev_date_added":null,"published":"2023-03-23"},{"cvss_score":9.8,"headline":"baserCMS SQL Injection vulnerability","id":"CVE-2017-10842","kev_date_added":null,"published":"2017-08-28"},{"cvss_score":9.2,"headline":"baserCMS: OS command injection vulnerability in installer","id":"CVE-2026-30880","kev_date_added":null,"published":"2026-03-31"},{"cvss_score":9.1,"headline":"baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)","id":"CVE-2026-21861","kev_date_added":null,"published":"2026-03-31"},{"cvss_score":9.1,"headline":"baserCMS: OS Command Injection in the baserCMS Update Functionality","id":"CVE-2026-30877","kev_date_added":null,"published":"2026-03-31"},{"cvss_score":9.1,"headline":"OS Command Injection Vulnerability and Potential Zip Slip Vulnerability","id":"CVE-2021-41243","kev_date_added":null,"published":"2021-11-26"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["baserCMS Users Community"]},"summary":"Remote authenticated attackers can inject arbitrary scripts into blog articles, potentially leading to code execution or account takeover.","url":"https://insights.sbomify.com/CVE-2021-20683/"}