CVE-2026-4325: Keycloak: Replay of action tokens via improper handling of single-use entries

CVE-2026-4325 · Severity: medium · CVSS 5.3 · Published 2026-04-02

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.

Technologies: org.keycloak:keycloak-services (Maven), Redhat Build Of Keycloak. Vendors: Maven, Redhat.

Quick answers

Is CVE-2026-4325 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-4325 being exploited in the wild.
How severe is CVE-2026-4325?
Medium severity, with a CVSS score of 5.3, published 2 April 2026.
Which products and versions are affected?
org.keycloak:keycloak-services (Maven) ECOSYSTEM:introduced=0,fixed=26.5.7.
Is there a fix for CVE-2026-4325?
Yes. org.keycloak:keycloak-services (Maven): upgrade to 26.5.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-4325?
Check whether you run org.keycloak:keycloak-services (Maven) or Redhat Build Of Keycloak at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.keycloak:keycloak-services (Maven): upgrade to 26.5.7 or later
    # set org.keycloak:keycloak-services to 26.5.7 in your pom.xml or build.gradle

Affected products

  • org.keycloak:keycloak-services (Maven) ECOSYSTEM:introduced=0,fixed=26.5.7
  • Redhat Build Of Keycloak

Identifiers

  • CVE-2026-4325
  • GHSA-rx66-hj7g-28h7

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