Cyber Resilience

CVE-2026-9689

Redhat Build Of Keycloak

Published
27 May 2026
Modified
05 August 2026
Patch / advisory
View advisory
CVSS Score v3.1 4.2
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS Score 0.0032 25th percentile
Risk Priority 34 floored blend · peak EPSS

Summary

CVE-2026-9689 is a medium-severity Improper Validation of Consistency within Input (CWE-1288) vulnerability in Redhat Build Of Keycloak. Its CVSS base score is 4.2 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 25th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web…

more

address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.

CWE(s)
CWE-1288

Related Threats

MITRE ATT&CK Enterprise Techniques

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-15943Same product: Redhat Build Of Keycloak
CVE-2026-14781Same product: Redhat Build Of Keycloak
CVE-2026-15572Same product: Redhat Build Of Keycloak
CVE-2026-9801Same product: Redhat Build Of Keycloak
CVE-2026-9803Same product: Redhat Build Of Keycloak
CVE-2026-9704Same product: Redhat Build Of Keycloak
CVE-2026-37978Same product: Redhat Build Of Keycloak
CVE-2026-7571Same product: Redhat Build Of Keycloak
CVE-2026-9798Same product: Redhat Build Of Keycloak
CVE-2026-8830Same product: Redhat Build Of Keycloak

Affected Assets

redhat
build of keycloak
all versions

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V2.2.2
  • V4.2.3
  • V12.3.2

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

SI-10 requires validity checks on supplied inputs, directly stopping acceptance of internally inconsistent complex data.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require consistency validation for complex inputs.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect consistency flaws but does not prevent them at design time.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle requires input validation and consistency checks that directly address CWE-1288.

A.8.26 Application security requirements partial match
prevents

Application security requirements include validation of complex inputs and cross-field consistency.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles encourage robust input handling but do not specifically mandate consistency validation.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly require validation of interrelated input fields to prevent CWE-1288.

References