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This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.","status":"published","published":"2024-01-26T14:23:43.185Z","modified":"2026-11-04T21:06:51.985Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-04T22:39:14.734949Z"}],"euvd":[{"id":"EUVD-2023-3249","description":"A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.","status":"published","published":"2024-01-26T14:23:43Z","modified":"2026-11-04T21:06:51Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-04T22:46:32.144626Z"}],"ghsa":[{"id":"GHSA-mpwq-j3xf-7m5w","title":"The redirect_uri validation logic allows for bypassing explicitly allowed hosts that would otherwise be restricted","description":"An issue was found in the redirect_uri validation logic that allows for a bypass of otherwise explicitly allowed hosts.\n\nThe problem arises in the verifyRedirectUri method, which attempts to enforce rules on user-controllable input, but essentially causes a desynchronization in how Keycloak and browsers interpret URLs. Keycloak, for example, receives \"[www%2ekeycloak%2eorg%2fapp%2f:y@example.com](https://www%2ekeycloak%2eorg%2fapp%2f:y@example.com/)\" and thinks the authority to be keycloak.org when it is actually example.com. This happens because the validation logic is performed on a URL decoded version, which no longer represents the original input.\n\n### Acknowledgements\nKarel Knibbe ","status":"published","published":"2023-12-21T18:25:30Z","modified":"2024-01-26T20:28:52Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:37:33.019154Z"}],"nvd":[{"id":"CVE-2023-6291","description":"A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.","status":"published","published":"2024-01-26T15:15:08.28Z","modified":"2026-11-04T21:17:27.17Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high","assessor":"secondary"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-04T23:43:36.946093Z"}],"osv":[{"id":"CVE-2023-6291","title":"Keycloak: redirect_uri validation bypass","description":"A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.","status":"published","published":"2024-01-26T14:23:43.185Z","modified":"2026-11-05T21:16:20.597890838Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-05T22:00:58.054534Z"},{"id":"GHSA-mpwq-j3xf-7m5w","title":"The redirect_uri validation logic allows for bypassing explicitly allowed hosts that would otherwise be restricted","description":"An issue was found in the redirect_uri validation logic that allows for a bypass of otherwise explicitly allowed hosts.\n\nThe problem arises in the verifyRedirectUri method, which attempts to enforce rules on user-controllable input, but essentially causes a desynchronization in how Keycloak and browsers interpret URLs. Keycloak, for example, receives \"[www%2ekeycloak%2eorg%2fapp%2f:y@example.com](https://www%2ekeycloak%2eorg%2fapp%2f:y@example.com/)\" and thinks the authority to be keycloak.org when it is actually example.com. This happens because the validation logic is performed on a URL decoded version, which no longer represents the original input.\n\n### Acknowledgements\nKarel Knibbe ","status":"published","published":"2023-12-21T18:25:30Z","modified":"2024-02-16T08:12:43.498216Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:46:52.170928Z"},{"id":"RHSA-2023:7854","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 7","status":"published","published":"2024-09-18T08:44:17Z","modified":"2026-09-22T10:03:05Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2023:7855","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 9","status":"published","published":"2024-09-18T08:44:38Z","modified":"2026-09-22T10:03:05Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2023:7856","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 8","status":"published","published":"2024-09-18T08:44:27Z","modified":"2026-09-22T10:03:06Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2024:0798","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.6.7 security update on RHEL 7","status":"published","published":"2024-09-30T10:15:54Z","modified":"2026-10-13T10:06:13Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2024:0799","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.6.7 security update on RHEL 8","status":"published","published":"2024-09-30T10:16:03Z","modified":"2026-10-13T10:06:14Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2024:0800","title":"Red Hat Security Advisory: Red Hat Single Sign-On 7.6.7 security update on RHEL 9","status":"published","published":"2024-09-30T10:16:32Z","modified":"2026-10-13T10:06:15Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:12.270484Z"}]}}