CVE-2026-18963 — Vulnerability in org.keycloak:keycloak-services —...

CRITICAL

Keycloak: Unauthenticated account takeover via reset-credentials flow bypass

Published August 18, 2026Updated August 28, 2026Source: osv

Summary

A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.

Advisory Timeline

First published August 18, 2026 (55 days ago).
Last revised August 28, 2026 — 10 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven

Update org.keycloak:keycloak-services to 26.6.6 or later

<!-- Update pom.xml dependency version to 26.6.6 for org.keycloak:keycloak-services -->

Maven

Update org.keycloak:keycloak-services to 26.4.15 or later

<!-- Update pom.xml dependency version to 26.4.15 for org.keycloak:keycloak-services -->

Maven

Update org.keycloak:keycloak-services to 26.7.2 or later

<!-- Update pom.xml dependency version to 26.7.2 for org.keycloak:keycloak-services -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: maven (1).

Package	Ecosystem	Affected	Fixed In
org.keycloak:keycloak-services	maven	26.5.0, 26.5.1, 26.5.2, 26.5.3 (+9 more)	26.6.6
org.keycloak:keycloak-services	maven	26.0.0, 26.0.1, 26.0.2, 26.0.3 (+31 more)	26.4.15
org.keycloak:keycloak-services	maven	26.7.0, 26.7.1	26.7.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-640
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-18963?: Keycloak: Unauthenticated account takeover via reset-credentials flow bypass This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-18963?: CVE-2026-18963 affects org.keycloak:keycloak-services. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-18963 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-4gv3-mc9p-5wqc

BIT-keycloak-2026-18963

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