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Vulnerability record · CVE-2026-9087 · published 20 May 2026

CVE-2026-9087: Redhat build of keycloak insecure direct object reference vulnerability

Redhat · Build Of Keycloak

A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.

8.1 CVSS 3.1 High EPSS 0.39% · top 69.3% CWE-639 · Insecure direct object reference
8.1CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
23 Jul 2026Last modified by NVD

Description

A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:25097
https://access.redhat.com/errata/RHSA-2026:25098
https://access.redhat.com/errata/RHSA-2026:30049
https://access.redhat.com/errata/RHSA-2026:30050
https://access.redhat.com/security/cve/CVE-2026-9087 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2480172 Issue TrackingVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-9087), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.