What is the CVSS score of CVE-2026-53405?

CVE-2026-53405 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Which versions of Apache Syncope are affected by CVE-2026-53405?

Apache Syncope's identity management platform (versions 3.0.x-4.1.x) contains a critical vulnerability that allows privileged administrators to gain full control of the identity system and underlying…

How to fix or mitigate CVE-2026-53405?

Within 24 hours: inventory all administrator accounts with workflow permissions and enable comprehensive audit logging for BPMN process imports and Groovy script execution. Within 7 days: restrict BPMN process import APIs to trusted definitions only, implement network segmentation isolating Syncope administrative interfaces, and disable Groovy scriptTasks where business logic permits. Within 30 days: obtain Apache vendor commitment on patch timeline, develop upgrade strategy for affected versions (3.0.x, 4.0.x, 4.1.x), and evaluate alternative identity platforms if patches unavailable beyond 90 days.

Apache Syncope CVE-2026-53405

EUVD-2026-45956 CRITICAL

Improper Isolation or Compartmentalization (CWE-653)

2026-07-20 apache

GHSA-xvr8-rwv3-hv45

Apache Information Disclosure Apache Syncope

9.8

CVSS 3.1 · Vendor: apache

Severity by source

Vendor (apache) PRIMARY

9.8 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

7.2 HIGH

Requires an administrator with workflow entitlements so PR:H (not PR:N); network-reachable REST API with no user interaction and unsandboxed code execution yields C/I/A:H.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Jul 21, 2026 - 16:35 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Jul 21, 2026 - 16:22 vuln.today

cvss_changed

CVSS changed

Jul 21, 2026 - 16:22 NVD

9.8 (CRITICAL)

Analysis Generated

Jul 20, 2026 - 15:06 vuln.today

DescriptionCVE.org

Improper Isolation or Compartmentalization vulnerability in Apache Syncope.

An administrator with adequate entitlements can import arbitrary BPMN process definitions via the REST API and then start the process. When a BPMN process containing a Groovy scriptTask is imported and started, the Groovy script is executed directly on the server, with no sandbox.

This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 4.1.1.

Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by wrapping Flowable's Groovy scriptTasks with security sandbox.

AnalysisAI

Remote code execution in Apache Syncope's workflow engine lets an administrator holding sufficient entitlements run arbitrary Groovy code on the server by importing and starting a malicious BPMN process definition through the REST API. Because Flowable's Groovy scriptTasks execute with no sandbox in affected 3.0.x, 4.0.x, and 4.1.x releases, script code embedded in the process runs directly with the privileges of the Syncope core JVM. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Obtain entitled admin credentials

Delivery

Author BPMN with Groovy scriptTask

Exploit

Import definition via REST API

Execution

Start workflow process

Persist

Unsandboxed Groovy executes server-side

Impact

Remote code execution as core service

Access

Obtain entitled admin credentials

Delivery

Author BPMN with Groovy scriptTask

Exploit

Import definition via REST API

Execution

Start workflow process

Persist

Unsandboxed Groovy executes server-side

Impact

Remote code execution as core service

Vulnerability AssessmentAI

Exploitation	Exploitation requires an authenticated Apache Syncope administrator account holding the entitlements needed to import a BPMN process definition via the REST API and to start that process. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The published CVSS 3.1 base score is 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), modeling the flaw as unauthenticated network RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker who has obtained a Syncope administrator account with workflow entitlements (via credential theft, over-broad delegation, or a malicious insider) crafts a BPMN process definition containing a Groovy scriptTask that spawns a reverse shell. They import the definition through the REST API and start the process, causing the unsandboxed Groovy code to execute on the Syncope server and yielding remote code execution as the core service. …
Remediation	Vendor-released patch: upgrade to Apache Syncope 4.0.7 or 4.1.2, which fix the issue by wrapping Flowable's Groovy scriptTasks in a security sandbox (advisory: https://lists.apache.org/thread/vdq0tk6ylffz6trbgbllj9kb1ndzff7k). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory all administrator accounts with workflow permissions and enable comprehensive audit logging for BPMN process imports and Groovy script execution. …

Threat intelligence, references, and detailed analysis are available after sign-in.