{"answers":{"affected":"5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-21603 in the wild and no public exploit code.","fix":"Upgrade org.jenkins-ci.main:jenkins-core to 2.275 or later.","what":"CVE-2021-21603 is a medium-severity cross-site scripting vulnerability in Jenkins Jenkins, published on 13 Jan 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-2021-21603 and fix it if it is affected.\n\nWhat it is: CVE-2021-21603 is a medium-severity cross-site scripting vulnerability in Jenkins Jenkins, published on 13 Jan 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-2021-21603 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.jenkins-ci.main:jenkins-core (Maven): affected all versions; fixed in 2.275\n- org.jenkins-ci.main:jenkins-core (Maven): affected all versions; fixed in 2.275\n- org.jenkins-ci.main:jenkins-core (Maven): affected from 2.263.2; fixed in 2.275\n- org.jenkins-ci.main:jenkins-core (Maven): affected from 2.263.2; fixed in 2.275\n- jenkins (Bitnami): affected all versions; fixed in 2.274.1\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-2021-21603/ (Markdown: https://insights.sbomify.com/CVE-2021-21603/index.md)","id":"CVE-2021-21603","markdown":"https://insights.sbomify.com/CVE-2021-21603/index.md","name":"CVE-2021-21603","record":{"aliases":["BIT-jenkins-2021-21603","GHSA-98gq-6hxg-52r6"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Jenkins automation server","requires_auth":"low_privilege","summary":"An attacker can inject malicious scripts into Jenkins notification bars, potentially leading to session hijacking or code execution.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jenkins","cpe":[{"product":"jenkins","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 2.274 and earlier, LTS 2.263.1 and earlier does not escape notification bar response contents, resulting in a cross-site scripting (XSS) vulnerability.","ecosystems":["Bitnami","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 notification bar","id":"CVE-2021-21603","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"jenkins:jenkins","products":["jenkins:jenkins"],"type":"xss","year":"2021"},"n_packages":5,"n_references":1,"next":{"headline":"Improper handling of REST API XML deserialization errors in Jenkins","id":"CVE-2021-21604"},"packages":[{"ecosystem":"Bitnami","fixed":["2.274.1"],"introduced":["0"],"last_affected":[],"package":"jenkins","purl":"pkg:bitnami/jenkins","source":"BIT-jenkins-2021-21603"},{"ecosystem":"Maven","fixed":["2.275"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":null,"source":"GHSA-98gq-6hxg-52r6"},{"ecosystem":"Maven","fixed":["2.275"],"introduced":["0"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","source":"GHSA-98gq-6hxg-52r6"},{"ecosystem":"Maven","fixed":["2.275"],"introduced":["2.263.2"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":null,"source":"GHSA-98gq-6hxg-52r6"},{"ecosystem":"Maven","fixed":["2.275"],"introduced":["2.263.2"],"last_affected":[],"package":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","source":"GHSA-98gq-6hxg-52r6"}],"prev":{"headline":"Arbitrary file read vulnerability in workspace browsers in Jenkins","id":"CVE-2021-21602"},"products":["Jenkins"],"published":"2021-01-13","related":[{"cvss_score":9.8,"headline":"Jenkins Command Line Interface (CLI) Path Traversal","id":"CVE-2024-23897","kev_date_added":"2024-08-19","published":"2024-01-24"},{"cvss_score":9.8,"headline":"Jenkins Stapler Web Framework Deserialization of Untrusted Data","id":"CVE-2018-1000861","kev_date_added":"2022-02-10","published":"2018-12-10"},{"cvss_score":9.8,"headline":"Jenkins Remote Code Execution","id":"CVE-2017-1000353","kev_date_added":"2025-10-02","published":"2018-01-29"},{"cvss_score":7.5,"headline":"Jenkins User Interface (UI) Information Disclosure","id":"CVE-2015-5317","kev_date_added":"2023-05-12","published":"2015-11-25"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21690","kev_date_added":null,"published":"2021-11-04"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21691","kev_date_added":null,"published":"2021-11-04"},{"cvss_score":9.8,"headline":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","id":"CVE-2021-21692","kev_date_added":null,"published":"2021-11-04"}],"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":["Jenkins project"]},"summary":"An attacker can inject malicious scripts into Jenkins notification bars, potentially leading to session hijacking or code execution.","url":"https://insights.sbomify.com/CVE-2021-21603/"}