# CVE-2026-107124: Red Hat Build of Keycloak OIDC logout session fixation

Source: https://junglewise.ai/threats/cve-2026-107124-a-flaw-was-found-in-the-oidc-logout-endpoint-of-the-keycloak  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-107124 · Severity: medium · CVSS 6.4 · Published 2026-11-06

Red Hat Build of Keycloak is an identity provider that manages user authentication and sessions. An attacker can exploit a flaw in the OIDC logout endpoint to hijack a victim's login session by fixing a session ID in their browser, potentially gaining full control over their account, including administrator accounts.

Technologies: [Red Hat build of Keycloak](https://junglewise.ai/threats/technologies/red-hat-keycloak). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-107124 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107124 being exploited in the wild.

**How severe is CVE-2026-107124?** Medium severity, with a CVSS score of 6.4, published 6 November 2026.

**Which products and versions are affected?** Red Hat Build of Keycloak.

**Is there a fix for CVE-2026-107124?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-107124 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-107124?** Check whether you run Red Hat build of Keycloak. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a session fixation flaw (CWE-384) in the keycloak-services component's OIDC logout endpoint. An attacker can set a session cookie based on an unvalidated id_token_hint parameter before security checks complete, then trick a victim into visiting a crafted URL during a specific timing window to bind their login to the attacker-controlled session ID, leading to account takeover.

## Affected products

- Red Hat Build of Keycloak

## Timeline

- 2026-11-06: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-107124](https://access.redhat.com/security/cve/CVE-2026-107124)

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- [Keycloak server arbitrary code execution in client authorization](https://junglewise.ai/threats/cve-2026-120984-a-flaw-was-found-in-the-keycloak-server-s-client-management)
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- [Keycloak OIDC Dynamic Client Registration offline token revocation bypass](https://junglewise.ai/threats/cve-2026-107623-a-flaw-was-found-in-the-oidc-dynamic-client-registration-dcr)
- [Keycloak mTLS holder-of-key binding bypass in Standard Token Exchange](https://junglewise.ai/threats/cve-2026-97846-keycloak-provides-a-feature-called-mtls-holder-of-key-binding)