{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-13821 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-13821 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-13821 is a medium-severity cross-site scripting vulnerability in n/a, published on 26 Aug 2020. 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-2020-13821 and fix it if it is affected.\n\nWhat it is: CVE-2020-13821 is a medium-severity cross-site scripting vulnerability in n/a, published on 26 Aug 2020. 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-2020-13821 in the wild and no public exploit code.\n\nAffected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2020-13821/ (Markdown: https://insights.sbomify.com/CVE-2020-13821/index.md)","id":"CVE-2020-13821","markdown":"https://insights.sbomify.com/CVE-2020-13821/index.md","name":"CVE-2020-13821","record":{"aliases":["GHSA-9qcc-v828-vgx7"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["account_takeover","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"MQTT Broker Control Center","requires_auth":"low_privilege","summary":"Reflected XSS in HiveMQ Broker Control Center allows attackers to steal administrator session cookies via crafted MQTT packets.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"broker_control_center","vendor":"hivemq"}],"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":"An issue was discovered in HiveMQ Broker Control Center 4.3.2. A crafted clientid parameter in an MQTT packet (sent to the Broker) is reflected in the client section of the management console. The attacker's JavaScript is loaded in a browser, which can lead to theft of the session and cookie of the administrator's account of the Broker.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Cross-site scripting in n/a","id":"CVE-2020-13821","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2020"},"n_packages":0,"n_references":2,"next":{"headline":"Signature Malleabillity in elliptic","id":"CVE-2020-13822"},"packages":[],"prev":{"headline":"Cross-site scripting in n/a","id":"CVE-2020-13820"},"products":["n/a"],"published":"2020-08-26","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2024-08-04","vendors":["n/a"]},"summary":"Reflected XSS in HiveMQ Broker Control Center allows attackers to steal administrator session cookies via crafted MQTT packets.","url":"https://insights.sbomify.com/CVE-2020-13821/"}