{"answers":{"affected":"2 open source packages ship an affected version, including org.keycloak:keycloak-saml-core. It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-3827 in the wild and no public exploit code.","fix":"Upgrade org.keycloak:keycloak-saml-core to 18.0.0 or later.","what":"CVE-2021-3827 is a medium-severity authentication bypass vulnerability in Redhat Keycloak, published on 23 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-3827 and fix it if it is affected.\n\nWhat it is: CVE-2021-3827 is a medium-severity authentication bypass vulnerability in Redhat Keycloak, published on 23 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-3827 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.keycloak:keycloak-saml-core (Maven): affected all versions; fixed in 18.0.0\n- org.keycloak:keycloak-saml-core (Maven): affected all versions; fixed in 18.0.0\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-2021-3827/ (Markdown: https://insights.sbomify.com/CVE-2021-3827/index.md)","id":"CVE-2021-3827","markdown":"https://insights.sbomify.com/CVE-2021-3827/index.md","name":"CVE-2021-3827","record":{"aliases":["GHSA-4pc7-vqv5-5r3v"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Keycloak identity provider","requires_auth":"low_privilege","summary":"Attackers can bypass MFA authentication in Keycloak by exploiting the default ECP binding flow with crafted SOAP requests.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"keycloak","vendor":"redhat"},{"product":"openshift_container_platform","vendor":"redhat"},{"product":"single_sign-on","vendor":"redhat"}],"cvss":{"score":6.8,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.","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":"ECP SAML binding bypasses authentication flows","id":"CVE-2021-3827","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"redhat:keycloak","products":["redhat:keycloak","redhat:openshift_container_platform","redhat:single_sign-on"],"type":"auth_bypass","year":"2021"},"n_packages":2,"n_references":4,"next":{"headline":"Inefficient Regular Expression Complexity in nltk/nltk","id":"CVE-2021-3828"},"packages":[{"ecosystem":"Maven","fixed":["18.0.0"],"introduced":["0"],"last_affected":[],"package":"org.keycloak:keycloak-saml-core","purl":null,"source":"GHSA-4pc7-vqv5-5r3v"},{"ecosystem":"Maven","fixed":["18.0.0"],"introduced":["0"],"last_affected":[],"package":"org.keycloak:keycloak-saml-core","purl":"pkg:maven/org.keycloak/keycloak-saml-core","source":"GHSA-4pc7-vqv5-5r3v"}],"prev":{"headline":"Memory corruption in gcc","id":"CVE-2021-3826"},"products":["keycloak"],"published":"2022-08-23","related":[{"cvss_score":10,"headline":"Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC","id":"CVE-2022-4361","kev_date_added":null,"published":"2023-07-07"},{"cvss_score":9.8,"headline":"Keycloak vulnerable to privilege escalation on Token Exchange feature","id":"CVE-2022-1245","kev_date_added":null,"published":"2022-07-07"},{"cvss_score":9.6,"headline":"keycloak Self Stored Cross-site Scripting vulnerability","id":"CVE-2021-20195","kev_date_added":null,"published":"2021-05-28"},{"cvss_score":9.3,"headline":"Keycloak Authentication Error","id":"CVE-2019-14910","kev_date_added":null,"published":"2019-12-05"},{"cvss_score":9.3,"headline":"Keycloak Authentication Error","id":"CVE-2019-14909","kev_date_added":null,"published":"2019-12-04"},{"cvss_score":9.1,"headline":"Keycloak vulnerable to path traversal via double URL encoding","id":"CVE-2022-3782","kev_date_added":null,"published":"2023-01-11"},{"cvss_score":9.1,"headline":"keycloak vulnerable to unauthorized login via mail server setup","id":"CVE-2019-14837","kev_date_added":null,"published":"2020-01-07"}],"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 bypass MFA authentication in Keycloak by exploiting the default ECP binding flow with crafted SOAP requests.","url":"https://insights.sbomify.com/CVE-2021-3827/"}