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Red Hat Keycloak CVE-2026-18963

| EUVDEUVD-2026-61063 CRITICAL
Weak Password Recovery Mechanism for Forgotten Password (CWE-640)
2026-08-18 redhat GHSA-4gv3-mc9p-5wqc
9.1
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
9.1 CRITICAL

Unauthenticated remote reset-credentials bypass with no user interaction gives AV:N/AC:L/PR:N/UI:N; full account takeover yields C:H/I:H, and no service disruption gives A:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

2
Analysis Generated
Aug 18, 2026 - 17:44 vuln.today
CVE Published
Aug 18, 2026 - 17:05 nvd
CRITICAL 9.1

DescriptionCVE.org

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.

AnalysisAI

Account takeover in Red Hat Build of Keycloak allows an unauthenticated attacker to abuse the reset-credentials flow in the keycloak-services component to complete a password reset for any user without ever clicking the emailed verification link, letting them directly set new credentials. Because the mandatory email-ownership check can be bypassed, the flaw yields full control of arbitrary accounts (CVSS 9.1). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach Keycloak login endpoint
Delivery
Initiate reset-credentials for target user
Exploit
Bypass email verification link step
Execution
Set attacker-chosen password
Persist
Authenticate as victim
Impact
Access federated SSO applications

Vulnerability AssessmentAI

Exploitation Exploitation requires that the affected Keycloak realm expose the reset-credentials (self-service 'Forgot password') flow, which is a common but administrator-toggled feature - realms with 'Forgot password' disabled are not exposed via this path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are strongly aligned toward high priority: the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) describes remote, low-complexity, unauthenticated exploitation with no user interaction, and the impact is high confidentiality and integrity (account takeover) with no availability impact, giving 9.1. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote, unauthenticated attacker who knows or guesses a target username/email initiates the password-reset flow against an internet-facing Keycloak login endpoint and, by manipulating the reset-credentials flow, advances past the email-verification link step without receiving or clicking it. They then set a new password of their choosing and log in as the victim, gaining access to every downstream application federated through that SSO. …
Remediation Consult the Red Hat advisory (https://access.redhat.com/security/cve/CVE-2026-18963) and Bugzilla 2511595 (https://bugzilla.redhat.com/show_bug.cgi?id=2511595) and apply the vendor-supplied errata/update for your product stream as soon as it is published - no exact fixed version is stated in the available data, so no vendor-released patch version can be independently confirmed at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all Red Hat Build of Keycloak deployments and versions; identify downstream systems relying on affected instances for authentication; alert security and systems teams. …

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CVE-2026-18963 vulnerability details – vuln.today

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