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

Source: https://junglewise.ai/threats/cve-2026-4325-keycloak-replay-of-action-tokens-via-improper-handling-of-single  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-02  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/org-keycloak-keycloak-services), [Redhat Build Of Keycloak](https://junglewise.ai/threats/technologies/redhat-build-of-keycloak). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven), [Redhat](https://junglewise.ai/threats/vendors/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

  ```sh
  # 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

## Related threats

- [Keycloak unauthenticated account takeover via reset-credentials bypass](https://junglewise.ai/threats/cve-2026-18963-siemens-industrial-edge-management-authentication-bypass-in)
- [Duplicate Advisory: Authentication bypass via jwt algorithm confusion](https://junglewise.ai/threats/duplicate-advisory-authentication-bypass-via-jwt-algorithm-confusion-40489dee)
- [Keycloak JWT algorithm confusion in JWT Authorization Grant flow](https://junglewise.ai/threats/cve-2026-11800-keycloak-jwt-algorithm-confusion-in-jwt-authorization-grant-flow)
- [Duplicate Advisory: Keycloak vulnerable to authorization bypass via incorrect uri comparison](https://junglewise.ai/threats/duplicate-advisory-keycloak-vulnerable-to-authorization-bypass-via-009d6a49)
- [Duplicate Advisory: Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass](https://junglewise.ai/threats/duplicate-advisory-keycloak-vulnerable-to-cross-site-scripting-xss-via-1687acae)