External risk intelligence

Apache Syncope Missing Authorization Privilege Escalation

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-75030

Apache Syncope is an identity management system that may be deployed in various configurations. While it can be exposed as an administrative web interface, it is often deployed in internal network segments to manage identity lifecycle, meaning public internet exposure is plausible but not a default or guaranteed requirement for its core function.

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability exists in Apache Syncope, an identity management system, that could allow unauthorized administrators to manipulate group memberships. This issue matters because it affects core identity management functions, potentially leading to unauthorized access or control over user groups if an attacker can exploit it. The primary concern is to confirm if this technology is in use and if it is exposed in a way that could be targeted.

  • Unauthorized group management is possible.
  • Identity systems are foundational to access control.
  • Confirm Syncope usage and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could potentially exploit this vulnerability by leveraging missing authorization checks within Apache Syncope. This would allow an administrator, who already has some task execution privileges, to broadly add or remove group members without possessing the specific capabilities typically required for such actions. When exploited, this could lead to unauthorized modifications of group memberships.

  • Requires administrator access.
  • Triggered by mass member operations.
  • Risk of unauthorized group changes.

Live Threat

Current exploitation, exposure, and threat context

An administrator with task execution entitlements could bypass normal authorization controls to mass (de)provision group members. This means an attacker could potentially modify group memberships beyond their intended scope, impacting how users are organized and managed within the system.

  • Group membership data.
  • Unauthorized modification of group memberships.
  • Compromised identity management.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Apache Syncope likely requires action from teams managing identity and access management (IAM) systems, potentially falling under platform or application ownership, in coordination with security operations for exposure assessment. The first practical step is to identify all Apache Syncope deployments, determine their network reachability and business criticality, and then confirm the accountable owner for remediation planning.

  • Identify Syncope owners and deployments.
  • Verify network exposure and criticality.
  • Plan remediation based on identified risk.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is Apache Syncope and how is it used?

Apache Syncope is an open-source identity and access management platform. Organizations use it to automate the lifecycle of digital identities, manage user attributes, and synchronize account data across various enterprise systems and applications.

What does CWE-862 mean for CVE-2026-75030?

CWE-862 refers to a 'Missing Authorization' weakness. In this CVE, it means the software fails to verify that an administrator has the specific, correct permissions before allowing them to execute tasks that change group membership, potentially letting them perform actions they aren't authorized to do.

How does an attacker trigger this vulnerability?

An attacker needs existing task execution entitlements within the system to trigger this. Simply having general access is not enough; the bug is specifically triggered when an account with these limited task privileges attempts to mass provision or deprovision group members.

Is my Apache Syncope instance at risk?

Halo Surface Signal notes that while Apache Syncope is often placed in internal network segments to manage identities, public internet exposure is possible. You should care if your instance is reachable from untrusted networks or if you have multiple administrators with varying levels of task permissions.

What should I do to secure my system?

The most effective response is to upgrade your Apache Syncope installation to version 4.0.8 or 4.1.3, which contain the authorization fixes. Before patching, map out all running instances to understand your potential footprint and confirm which teams manage these identity services.

References