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CVE-2026-4325

Keycloak: keycloak: replay of action tokens via improper handling of single-use entries

Published: Apr 2, 2026Updated: Apr 16, 2026 Sources: CVE List NVDCWE-653
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 83.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an attacker to delete arbitrary single-use entries, which can enable the replay of consumed action tokens, such as password reset links. This could lead to unauthorized access or account compromise.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-653

Affected Products

build of keycloakredhat
On-prem
Security Products / identity-access-mgmt
Red Hat build of Keycloak 26.2Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.2.15Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.4Red Hat
On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.11Red Hat
On-prem
Operating Systems / linux-distro
redhatcommercialUSOperating Systemsaka red hat
red hatcommercialUSOperating Systemsaka red hat

Exploitability

Official Patch Available
Workaround Available

References

https://access.redhat.com/errata/RHSA-2026:6475
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:6476
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:6477
access.redhat.com
and 3 more references View all →

Timeline

Published
Apr 2, 2026
Last Updated
Apr 16, 2026

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