{"cve":"CVE-2026-2603","nvd":{"published":"2026-03-18T02:16:24.813","modified":"2026-08-18T17:48:33.180","status":"Analyzed","description":"A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-306"],"references":["https://access.redhat.com/errata/RHSA-2026:3925","https://access.redhat.com/errata/RHSA-2026:3926","https://access.redhat.com/errata/RHSA-2026:3947","https://access.redhat.com/errata/RHSA-2026:3948","https://access.redhat.com/security/cve/CVE-2026-2603"],"products":["redhat:build_of_keycloak"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-2603","score":0.00441,"percentile":0.38373,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-x4p7-7chp-64hq","url":"https://osv.dev/vulnerability/GHSA-x4p7-7chp-64hq","summary":"Keycloak: Unauthorized authentication via disabled SAML Identity Provider","modified":"2026-08-26T01:11:37.453123638Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","ranges":["<26.5.5"],"fixed":["26.5.5"]},{"ecosystem":"Maven","name":"org.keycloak:keycloak-server-spi-private","purl":"pkg:maven/org.keycloak/keycloak-server-spi-private","ranges":["<26.5.5"],"fixed":["26.5.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}