{"answers":{"affected":"4 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-37977 in the wild and no public exploit code.","fix":"Upgrade org.keycloak:keycloak-services to a fixed version for your release line: 26.4.13 or 26.6.3.","what":"CVE-2026-37977 is a low-severity vulnerability in Redhat Build of Keycloak, published on 6 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-37977 and fix it if it is affected.\n\nWhat it is: CVE-2026-37977 is a low-severity vulnerability in Redhat Build of Keycloak, published on 6 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-37977 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 26.4.13\n- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 26.4.13\n- org.keycloak:keycloak-services (Maven): affected from 26.5.0; fixed in 26.6.3\n- org.keycloak:keycloak-services (Maven): affected from 26.5.0; fixed in 26.6.3\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-2026-37977/ (Markdown: https://insights.sbomify.com/CVE-2026-37977/index.md)","id":"CVE-2026-37977","markdown":"https://insights.sbomify.com/CVE-2026-37977/index.md","name":"CVE-2026-37977","record":{"aliases":["ECHO-84f9-e9cf-32fc","GHSA-5v8v-xvjv-57x7","MINI-4jx5-hmg6-3qmv","MINI-7wm3-grjx-7m6q"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Keycloak identity server","requires_auth":"none","summary":"Attackers can inject CORS headers via unvalidated JWT claims to expose low-sensitivity error data, requiring misconfigured webOrigins.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"build_of_keycloak","vendor":"redhat"}],"cvss":{"score":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"description":"A flaw was found in Keycloak. A remote attacker can exploit a Cross-Origin Resource Sharing (CORS) header injection vulnerability in Keycloak's User-Managed Access (UMA) token endpoint. This flaw occurs because the `azp` claim from a client-supplied JSON Web Token (JWT) is used to set the `Access-Control-Allow-Origin` header before the JWT signature is validated. When a specially crafted JWT with an attacker-controlled `azp` value is processed, this value is reflected as the CORS origin, even if the grant is later rejected. This can lead to the exposure of low-sensitivity information from authorization server error responses, weakening origin isolation, but only when a target client is misconfigured with `webOrigins: [\"*\"]`.","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":"Keycloak vulnerable to information disclosure via CORS header injection due to unvalidated JWT azp claim","id":"CVE-2026-37977","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"redhat:build_of_keycloak","products":["redhat:build_of_keycloak"],"type":"information_disclosure","year":"2026"},"n_packages":4,"n_references":6,"next":{"headline":"Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admin api","id":"CVE-2026-37978"},"packages":[{"ecosystem":"Maven","fixed":["26.4.13"],"introduced":["0"],"last_affected":[],"package":"org.keycloak:keycloak-services","purl":null,"source":"GHSA-5v8v-xvjv-57x7"},{"ecosystem":"Maven","fixed":["26.4.13"],"introduced":["0"],"last_affected":[],"package":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","source":"GHSA-5v8v-xvjv-57x7"},{"ecosystem":"Maven","fixed":["26.6.3"],"introduced":["26.5.0"],"last_affected":[],"package":"org.keycloak:keycloak-services","purl":null,"source":"GHSA-5v8v-xvjv-57x7"},{"ecosystem":"Maven","fixed":["26.6.3"],"introduced":["26.5.0"],"last_affected":[],"package":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","source":"GHSA-5v8v-xvjv-57x7"}],"prev":{"headline":"Command injection in n/a","id":"CVE-2026-37751"},"products":["Red Hat build of Keycloak 26.4","Red Hat build of Keycloak 26.4.13","Red Hat build of Keycloak 26.6","Red Hat build of Keycloak 26.6.3"],"published":"2026-04-06","related":[{"cvss_score":8.8,"headline":"Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation","id":"CVE-2026-15572","kev_date_added":null,"published":"2026-08-05"},{"cvss_score":8.8,"headline":"Keycloak SAML Broken has Authentication Bypass by Primary Weakness","id":"CVE-2026-3047","kev_date_added":null,"published":"2026-03-05"},{"cvss_score":8.1,"headline":"Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher","id":"CVE-2026-15573","kev_date_added":null,"published":"2026-08-05"},{"cvss_score":8.1,"headline":"Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers","id":"CVE-2026-16102","kev_date_added":null,"published":"2026-08-05"},{"cvss_score":8.1,"headline":"Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users","id":"CVE-2026-1609","kev_date_added":null,"published":"2026-07-16"},{"cvss_score":8.1,"headline":"Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion","id":"CVE-2026-11800","kev_date_added":null,"published":"2026-06-25"},{"cvss_score":8.1,"headline":"Keycloak-policy-enforcer: keycloak policy enforcer: authorization bypass via incorrect uri comparison","id":"CVE-2026-9800","kev_date_added":null,"published":"2026-06-25"}],"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-26","vendors":["Red Hat"]},"summary":"Attackers can inject CORS headers via unvalidated JWT claims to expose low-sensitivity error data, requiring misconfigured webOrigins.","url":"https://insights.sbomify.com/CVE-2026-37977/"}