A flaw was found in Keycloak’s CIBA feature where insufficient validation of client-configured backchannel notification endpoints could allow blind server-side requests to internal services.
This CVE has been withdrawn by MITRE
MITRE marked CVE-2026-1518 as REJECTED on . It is no longer considered a valid vulnerability record. The original content below is preserved for historical reference only.
Reason given by MITRE
DO NOT USE THIS CANDIDATE NUMBER. After further review by the Keycloak project and Red Hat, the reported SSRF via client registration/backchannel notification URIs was determined not to constitute a security vulnerability. The reported behavior is expected administrator-controlled functionality, and Keycloak provides documented mitigations through Client Policies, including the Secure Client URIs Pattern executor. Therefore, this CVE has been rejected.
CVE-2026-1518
✕ Withdrawn — historical dataLOWNVD 2.7
2.7CVSS
- CVSS v3
- 2.7
- EchelonGraph score
- Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.
- EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- —Not applicable: this CVE ID was withdrawn
Published
February 2, 2026
Last Modified
April 15, 2026
References (2)
- secalert@redhathttps://access.redhat.com/security/cve/CVE-2026-1518
- secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2433727
Frequently asked(4)
What is CVE-2026-1518?
CVE-2026-1518 is a rejected CVE ID: its record was withdrawn on July 24, 2026 and no longer describes a vulnerability. Reason given: DO NOT USE THIS CANDIDATE NUMBER. After further review by the Keycloak project and Red Hat, the reported SSRF via client registration/backchannel notification URIs was determined not to constitute a security vulnerability. The reported behavior is expected administrator-controlled functionality, and Keycloak provides documented mitigations through Client Policies, including the Secure Client URIs Pattern executor. Therefore, this CVE has been rejected.
When was the CVE record for CVE-2026-1518 published?
The CVE record for CVE-2026-1518 was published on February 2, 2026. EchelonGraph's copy of the record carries a last-modified date of April 15, 2026; the record at its source may have been updated since.
What is the CVSS score of CVE-2026-1518?
CVE-2026-1518 has a CVSS v3 base score of 2.7 (NVD).
How do I remediate CVE-2026-1518?
There is nothing to remediate under CVE-2026-1518: it is a rejected (withdrawn) CVE ID and no longer describes a vulnerability.