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CVE-2026-7571

Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client data

Published: May 19, 2026Updated: Jun 3, 2026 Sources: CVE List NVDCWE-472
NVD MITRE
7.1CVSSHIGH
EPSS Score
0.3%
Top 74.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-472

Affected Products

Red Hat build of Keycloak 26.4Red Hat
On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.12Red Hat
On-prem
Operating Systems / linux-distro
build of keycloakredhat
On-prem
Security Products / identity-access-mgmt
red hatcommercialUSOperating Systemsaka red hat
redhatcommercialUSOperating Systemsaka red hat

Exploitability

Official Patch Available
Workaround Available

References

https://access.redhat.com/errata/RHSA-2026:19596
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:19597
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-7571
access.redhat.com
and 1 more references View all →

Timeline

Published
May 19, 2026
Last Updated
Jun 3, 2026

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