{"answers":{"affected":"2 open source packages ship an affected version, including qiita-markdown. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-28833 in the wild and no public exploit code.","fix":"Upgrade qiita-markdown to 0.34.0 or later.","what":"CVE-2021-28833 is a medium-severity cross-site scripting vulnerability in n/a, published on 21 Jun 2021. 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-2021-28833 and fix it if it is affected.\n\nWhat it is: CVE-2021-28833 is a medium-severity cross-site scripting vulnerability in n/a, published on 21 Jun 2021. 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-2021-28833 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- qiita-markdown (RubyGems): affected all versions; fixed in 0.34.0\n- qiita-markdown (RubyGems): affected all versions; fixed in 0.34.0\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-2021-28833/ (Markdown: https://insights.sbomify.com/CVE-2021-28833/index.md)","id":"CVE-2021-28833","markdown":"https://insights.sbomify.com/CVE-2021-28833/index.md","name":"CVE-2021-28833","record":{"aliases":["GHSA-9p29-94hp-8rvc"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby Markdown library","requires_auth":"none","summary":"Attackers can execute arbitrary scripts in user browsers via crafted gist links in the Qiita::Markdown Ruby library.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"qiita\\","vendor":"increments"}],"cvss":{"score":6.1,"severity":"medium","source":"nvd","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":"Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.","ecosystems":["RubyGems"],"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":"qiita-markdown Cross-site Scripting vulnerability","id":"CVE-2021-28833","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":"xss","year":"2021"},"n_packages":2,"n_references":2,"next":{"headline":"Remote code execution in Kramdown","id":"CVE-2021-28834"},"packages":[{"ecosystem":"RubyGems","fixed":["0.34.0"],"introduced":["0"],"last_affected":[],"package":"qiita-markdown","purl":null,"source":"GHSA-9p29-94hp-8rvc"},{"ecosystem":"RubyGems","fixed":["0.34.0"],"introduced":["0"],"last_affected":[],"package":"qiita-markdown","purl":"pkg:gem/qiita-markdown","source":"GHSA-9p29-94hp-8rvc"}],"prev":{"headline":"Code injection in n/a","id":"CVE-2021-28832"},"products":["n/a"],"published":"2021-06-21","related":[{"cvss_score":6.1,"headline":"Cross-Site Scripting in Qiita-Markdown","id":"CVE-2021-28796","kev_date_added":null,"published":"2021-03-18"}],"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":["n/a"]},"summary":"Attackers can execute arbitrary scripts in user browsers via crafted gist links in the Qiita::Markdown Ruby library.","url":"https://insights.sbomify.com/CVE-2021-28833/"}