{"id":"CVE-2026-4874","title":"A flaw was found in Keycloak","summary":"A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to…","severity":"low","cvss":3.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-918"],"published":"2026-03-26","updated":"2026-06-26","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-4874","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:25097","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:25098","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30049","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30050","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-4874","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451611","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00295,"epssPercentile":0.22376,"ingestedAt":"2026-06-26T16:43:13.621Z","slug":"CVE-2026-4874","body":"## Overview\n\nA flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":17,"depthScoreParts":{"impact":17.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}