Vulnerability in Red Hat Build Of Keycloak
CVE-2026-15943
A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-15943 (vdb-entry, Vendor Advisory)
- RHBZ#2501270 (issue-tracking, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-15943?
- CVE-2026-15943 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under CWE-1288. CVSS score: 5.5/10. Published 2026-07-17.
- How severe is CVE-2026-15943?
- Medium severity. CVSS v3 base score is 5.5 out of 10.