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HIGH severity

CVE-2026-92855 — Red Hat

HIGH

CVE-2026-92855 is a high-severity (CVSS 7.4) Improper Authentication vulnerability. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

A flaw was found in the SAML identity broker component of Keycloak, which is used to delegate authentication to external identity providers. The issue occurs because the broker fails…

Published
Updated
Affected
—
Patched
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Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

A flaw was found in the SAML identity broker component of Keycloak, which is used to delegate authentication to external identity providers. The issue occurs because the broker fails to verify that a user actually possesses the private key associated with a holder-of-key assertion. An attacker who intercepts a victim signed assertion can replay it to gain unauthorized access and impersonate the victim without needing their private key.

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    The records we use list no fixed release for CVE-2026-92855. Check the upstream advisory for a patched version, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that exploitation requires the attacker to obtain a valid signed SAML assertion issued for a victim. Successful exploitation allows an attacker to bypass authentication and impersonate users within the Keycloak…

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Source: Red Hat security advisory for CVE-2026-92855 (CC BY 4.0)
ProductFixed inAdvisory
Red Hat build of Keycloak 26.4keycloak-rhel9-container-26.4-29RHSA-2026:95760
Red Hat build of Keycloak 26.6.8keycloak/rhbk-openshift-rhel9RHSA-2026:95761

Frequently Asked Questions

A flaw was found in the SAML identity broker component of Keycloak, which is used to delegate authentication to external identity providers. The issue occurs because the broker fails to verify that a user actually possesses the private key associated with a holder-of-key assertion. An attacker who intercepts a victim signed assertion can replay it to gain unauthorized access and impersonate the victim without needing their private key.
O3 Security · Impact-Aware SCA

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