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Keycloak: Unauthenticated account takeover via reset-credentials flow bypass

Critical severity GitHub Reviewed Published Aug 18, 2026 to the GitHub Advisory Database • Updated Aug 28, 2026

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

>= 26.0.0, < 26.4.15
>= 26.5.0, < 26.6.6
>= 26.7.0, < 26.7.2

Patched versions

26.4.15
26.6.6
26.7.2

Description

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.

References

Published by the National Vulnerability Database Aug 18, 2026
Published to the GitHub Advisory Database Aug 18, 2026
Reviewed Aug 28, 2026
Last updated Aug 28, 2026

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(87th percentile)

Weaknesses

Weak Password Recovery Mechanism for Forgotten Password

The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak. Learn more on MITRE.

CVE ID

CVE-2026-18963

GHSA ID

GHSA-4gv3-mc9p-5wqc

Source code

Credits

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