Vulnerability in Red Hat Build Of Keycloak
CVE-2026-7571
A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.5% 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: 0.004 · change: +0.001
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4.12-1, 26.4-17
- Red Hat Build Of Keycloak 26.4.12
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-7571 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:19597 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:19596 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-7571?
- CVE-2026-7571 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under CWE-472. CVSS score: 7.1/10. Published 2026-05-19.
- How severe is CVE-2026-7571?
- High severity. CVSS v3 base score is 7.1 out of 10.