CVE-2026-78336: Apache Syncope: OIDCC4UI provider list discloses client secrets to any authenticated user
Insertion of sensitive information into sent data vulnerability in Apache Syncope.
Any authenticated user can query for the list of available OIDC providers configured for SSO with Console and Enduser. The returned payload contains all configuration settings, including client secrets, regardless of the entitlements owned by the caller.
This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 through 4.0.7, from 4.1.0-M0 through 4.1.2.
Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Syncopeto a version that resolves this vulnerability.Fixed in 4.0.8 / 4.1.3
Event History
Frequently Asked Questions
Which deployments are affected?
Apache Syncope versions 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2 are affected when OIDC providers are configured for SSO with Console or Enduser.
What does an attacker need to exploit this issue?
The attacker only needs to be authenticated to Syncope. The disclosure occurs regardless of the caller's entitlements.
What information can be exposed?
The OIDC provider-list response includes all provider configuration settings, including client secrets.
How can this be remediated?
Upgrade to Apache Syncope 4.0.8 or 4.1.3, which fix the issue.