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Red Hat Build Of Keycloak EUVDEUVD-2026-18210

| CVE-2026-4325 MEDIUM
Improper Isolation or Compartmentalization (CWE-653)
2026-04-02 redhat GHSA-rx66-hj7g-28h7
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Red Hat
5.3 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

4
Patch released
Apr 04, 2026 - 08:30 nvd
Patch available
EUVD ID Assigned
Apr 02, 2026 - 13:15 euvd
EUVD-2026-18210
Analysis Generated
Apr 02, 2026 - 13:15 vuln.today
CVE Published
Apr 02, 2026 - 12:44 nvd
MEDIUM 5.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 54 maven packages depend on org.keycloak:keycloak-services (26 direct, 28 indirect)

Ecosystem-wide dependent count for version 26.5.7.

DescriptionCVE.org

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.

AnalysisAI

Keycloak's SingleUseObjectProvider lacks proper type and namespace isolation, allowing unauthenticated remote attackers with user interaction to delete arbitrary single-use entries and replay consumed action tokens such as password reset links, leading to account compromise. The vulnerability requires user interaction (UI:R) and high attack complexity (AC:H), resulting in a CVSS score of 5.3. No public exploit code or active exploitation has been confirmed at time of analysis.

Technical ContextAI

Keycloak's SingleUseObjectProvider is a global key-value store mechanism responsible for managing single-use tokens and action tokens, including password reset and email verification links. The vulnerability stems from improper isolation of token types and namespaces (CWE-653: Unsupported Feature in Generator), allowing attackers to manipulate the store without proper access controls or validation. This design flaw enables an attacker to enumerate and delete entries belonging to other users or sessions, effectively invalidating the single-use constraint that these tokens are designed to enforce. The affected component is present in Red Hat Build of Keycloak across multiple versions as indicated by the wildcard CPE specification.

RemediationAI

Organizations running Red Hat Build of Keycloak should apply the vendor-released patch corresponding to their deployed version as soon as practical. Consult Red Hat's official security advisory at https://access.redhat.com/security/cve/CVE-2026-4325 for specific patched version numbers and upgrade instructions. Interim mitigations should focus on restricting access to password reset and account recovery flows to authenticated, trusted networks if operationally feasible, and monitoring for unusual token consumption patterns. Organizations should prioritize patching authentication-critical systems first, given the potential for account compromise through token replay attacks.

CVE-2026-18963 CRITICAL POC
9.1 Aug 18

Account takeover in Red Hat Build of Keycloak allows an unauthenticated attacker to abuse the reset-credentials flow in

CVE-2026-16442 CRITICAL
9.8 Aug 05

Account takeover in Keycloak (Red Hat build of Keycloak, Red Hat Single Sign-On 7) arises because the IdP-initiated SAML

CVE-2026-16443 CRITICAL
9.1 Aug 05

Authentication bypass in Red Hat Build of Keycloak (and Red Hat Single Sign-On 7) lets an unauthenticated attacker forge

CVE-2026-15572 HIGH
8.8 Aug 05

Privilege escalation in Red Hat Build of Keycloak's Dynamic Client Registration (DCR) grants an attacker with low-privil

CVE-2026-9800 HIGH
8.1 Jun 25

Authorization bypass in the Keycloak Policy Enforcer allows any authenticated user to circumvent all enforced access con

CVE-2026-15573 HIGH
8.1 Aug 05

URI normalization bypass in Keycloak's Authorization Services PathMatcher allows authenticated low-privilege users to re

CVE-2026-16102 HIGH
8.1 Aug 05

Privilege escalation in Keycloak's Dynamic Client Registration (DCR) component allows attackers with standard user accou

CVE-2026-18214 HIGH
8.1 Jul 31

Token exchange in Keycloak bypasses Google Workspace domain allowlist restrictions, enabling any valid Google account ho

CVE-2026-11800 HIGH
8.1 Jun 25

Signature-verification bypass in Keycloak (and Red Hat's Keycloak-based products such as Red Hat Single Sign-On 7 and Re

CVE-2026-18215 HIGH
8.1 Jul 31

Tenant-restriction bypass in Keycloak's Microsoft identity provider integration allows attackers holding any valid Micro

CVE-2026-18967 HIGH
8.1 Aug 06

Session hijacking via SAML assertion replay in Keycloak's SAML broker component allows adjacent-network attackers to aut

CVE-2026-7504 HIGH
8.1 May 19

Open redirect in Red Hat build of Keycloak permits remote attackers to send victims to attacker-controlled hosts by abus

Vendor StatusVendor

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EUVD-2026-18210 vulnerability details – vuln.today

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