{"answers":{"affected":"2 open source packages ship an affected version, including io.jenkins.plugins:markdown-formatter. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21660 in the wild and no public exploit code.","fix":"Upgrade io.jenkins.plugins:markdown-formatter to 0.2.0 or later.","what":"CVE-2021-21660 is a medium-severity cross-site scripting vulnerability in Jenkins Markdown Formatter Plugin, published on 25 May 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-2021-21660 and fix it if it is affected.\n\nWhat it is: CVE-2021-21660 is a medium-severity cross-site scripting vulnerability in Jenkins Markdown Formatter Plugin, published on 25 May 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-2021-21660 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.jenkins.plugins:markdown-formatter (Maven): affected all versions; fixed in 0.2.0\n- io.jenkins.plugins:markdown-formatter (Maven): affected all versions; fixed in 0.2.0\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-2021-21660/ (Markdown: https://insights.sbomify.com/CVE-2021-21660/index.md)","id":"CVE-2021-21660","markdown":"https://insights.sbomify.com/CVE-2021-21660/index.md","name":"CVE-2021-21660","record":{"aliases":["GHSA-xqpp-26pp-2365"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Jenkins Markdown Plugin","requires_auth":"low_privilege","summary":"Attackers with edit permissions can inject malicious scripts via crafted URLs in Markdown descriptions, leading to stored XSS attacks against Jenkins users.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jenkins","cpe":[{"product":"markdown_formatter","vendor":"jenkins"}],"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":"Jenkins Markdown Formatter Plugin 0.1.0 and earlier does not sanitize crafted link target URLs, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to edit any description rendered using the configured markup formatter.","ecosystems":["Maven"],"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":"XSS vulnerability in Jenkins Markdown Formatter Plugin","id":"CVE-2021-21660","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"xss","year":"2021"},"n_packages":2,"n_references":3,"next":{"headline":"Missing Authorization in Jenkins Kubernetes CLI Plugin","id":"CVE-2021-21661"},"packages":[{"ecosystem":"Maven","fixed":["0.2.0"],"introduced":["0"],"last_affected":[],"package":"io.jenkins.plugins:markdown-formatter","purl":null,"source":"GHSA-xqpp-26pp-2365"},{"ecosystem":"Maven","fixed":["0.2.0"],"introduced":["0"],"last_affected":[],"package":"io.jenkins.plugins:markdown-formatter","purl":"pkg:maven/io.jenkins.plugins/markdown-formatter","source":"GHSA-xqpp-26pp-2365"}],"prev":{"headline":"XXE vulnerability in Jenkins URLTrigger Plugin","id":"CVE-2021-21659"},"products":["Jenkins Markdown Formatter Plugin"],"published":"2021-05-25","related":[],"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":["Jenkins project"]},"summary":"Attackers with edit permissions can inject malicious scripts via crafted URLs in Markdown descriptions, leading to stored XSS attacks against Jenkins users.","url":"https://insights.sbomify.com/CVE-2021-21660/"}