CVE-2026-73579

Apache Syncope, an open-source identity management platform, fails to correctly enforce authorization on search requests (CWE-863). When any user performs a non-recursive search, the Realms filter — the component that restricts results to the requester's assigned permissions — can be rendered as empty in the generated SQL, Neo4j, or Elasticsearch/OpenSearch query, voiding all privilege restrictions. An authenticated attacker with even minimal access can therefore enumerate users, groups, and other identity objects across the entire deployment, potentially harvesting usernames, attributes, and other sensitive identity data. All deployments on 3.0.0-M0–3.0.16, 4.0.0-M0–4.0.7, and 4.1.0-M0–4.1.2 are affected; there is no evidence of exploitation in the wild and no public proof of concept.

What to do: Upgrade to Apache Syncope 4.0.8 or 4.1.3 as soon as possible; no fix is listed for the 3.0.x line, so 3.0 deployments should migrate to a patched 4.x release. In the interim, restrict access to the Syncope console and REST API to trusted administrators and audit logs for non-recursive search activity from low-privileged or delegated users. Check whether delegated admins or regular users previously enumerated identities outside their assigned realms, and treat any exposed identity data accordingly.