Keycloak Vulnerability in Single Use Object Provider Allows Unauthorized Access
CVE-2026-4325

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak 26.2
Red Hat Build Of Keycloak 26.2.15
Red Hat Build Of Keycloak 26.4
Red Hat Build Of Keycloak 26.4.11
Vendor
CVE Published:
2 April 2026

What is CVE-2026-4325?

A flaw in Keycloak's SingleUseObjectProvider, a global key-value store, compromises type and namespace isolation. This vulnerability allows attackers to delete arbitrary single-use entries, which can lead to replay attacks on consumed action tokens such as password reset links, potentially resulting in unauthorized access or account compromise.

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Deploy the Patch

Affected Version(s)

Red Hat build of Keycloak 26.2 26.2.15-1

Red Hat build of Keycloak 26.2 26.2-18

Red Hat build of Keycloak 26.2 26.2-18

References

https://access.redhat.com/errata/RHSA-2026:6475
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6476
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6477
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Ngọc Chung Kim for reporting this issue.
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