Medium [CVE-2026-16104] Authenticator config endpoint exposes raw reCAPTCHA secrets to view-only admins
This medium-severity Red Hat Linux advisory covers CVE-2026-16104 affecting Red Hat Build of Keycloak.
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Summary
A flaw was found in the authentication configuration endpoint of the keycloak-services component, which is the core engine for Red Hat Build of Keycloak identity and access management.
The issue occurs because the system fails to mask sensitive configuration values, such as reCAPTCHA secret keys, when they are requested by administrators with view-only permissions. This can lead to the exposure of third-party service credentials to unauthorized personnel or through administrative logs.
The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires the attacker to have authenticated administrative access with at least view-realm permissions. Successful exploitation allows an attacker to retrieve raw reCAPTCHA secrets and view them in administrative event logs.
The vulnerability's root cause is the improper handling of sensitive configuration fields during the conversion of internal models to their API representations. Affected Red Hat products: Red Hat Build of Keycloak.
Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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