{"answers":{"affected":"2 open source packages ship an affected version, including yapi-vendor. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-27884 in the wild and no public exploit code.","fix":"Upgrade yapi-vendor to 1.9.3 or later.","what":"CVE-2021-27884 is a medium-severity vulnerability in n/a, published on 1 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-27884 and fix it if it is affected.\n\nWhat it is: CVE-2021-27884 is a medium-severity vulnerability in n/a, published on 1 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-27884 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- yapi-vendor (npm): affected all versions; fixed in 1.9.3\n- yapi-vendor (npm): affected all versions; fixed in 1.9.3\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-2021-27884/ (Markdown: https://insights.sbomify.com/CVE-2021-27884/index.md)","id":"CVE-2021-27884","markdown":"https://insights.sbomify.com/CVE-2021-27884/index.md","name":"CVE-2021-27884","record":{"aliases":["GHSA-2h3h-vw8r-82rp"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["account_takeover"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"YApi API management","requires_auth":"none","summary":"Weak JWT secret generation allows attackers to forge tokens and take over other users' accounts in YApi.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"yapi","vendor":"ymfe"}],"cvss":{"score":5.1,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-330","name":"Use of Insufficiently Random Values"}],"description":"Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs because Math.random in Node.js is used.","ecosystems":["npm"],"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":"Weak JSON Web Token in yapi-vendor","id":"CVE-2021-27884","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"weak_cryptography","year":"2021"},"n_packages":2,"n_references":2,"next":{"headline":"Cross-site request forgery in n/a","id":"CVE-2021-27885"},"packages":[{"ecosystem":"npm","fixed":["1.9.3"],"introduced":["0"],"last_affected":[],"package":"yapi-vendor","purl":null,"source":"GHSA-2h3h-vw8r-82rp"},{"ecosystem":"npm","fixed":["1.9.3"],"introduced":["0"],"last_affected":[],"package":"yapi-vendor","purl":"pkg:npm/yapi-vendor","source":"GHSA-2h3h-vw8r-82rp"}],"prev":{"headline":"Veritas Backup Exec Agent Command Execution","id":"CVE-2021-27878"},"products":["n/a"],"published":"2021-03-01","related":[{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2025-70059","kev_date_added":null,"published":"2026-03-09"},{"cvss_score":7.4,"headline":"yapi disables TLS/SSL certificate validation via rejectUnauthorized: false in Axios HTTPS agent","id":"CVE-2025-70058","kev_date_added":null,"published":"2026-02-23"},{"cvss_score":5.4,"headline":"Cross-site scripting in n/a","id":"CVE-2025-70060","kev_date_added":null,"published":"2026-03-09"},{"cvss_score":5.4,"headline":"Cross-site Scripting in yapi-vendor","id":"CVE-2021-36686","kev_date_added":null,"published":"2023-01-26"},{"cvss_score":5.4,"headline":"Cross-site Scripting in yapi-vendor","id":"CVE-2018-17574","kev_date_added":null,"published":"2018-09-28"}],"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":"Weak JWT secret generation allows attackers to forge tokens and take over other users' accounts in YApi.","url":"https://insights.sbomify.com/CVE-2021-27884/"}