CVE-2026-92856
Keycloak-services: keycloak-services: saml broker ignores proxyrestriction delegation constraints
What happened?
A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used.
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| keycloak/rhbk-openshift-rhel9Red Hat | Default status: unaffected | See vendor advisory |
| keycloak-servicesRed Hat | Default status: unaffected | See vendor advisory |
| rhbk/keycloak-rhel9Red Hat | Default status: unaffected | See vendor advisory |
| keycloak-servicesRed Hat | Default status: affected | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.