Read the docs
TI-2020-01883 Aliases CVE-2020-1959GHSA-vjqw-r3ww-wj2w

Expression language injection in Apache Syncope

Priority MEDIUM 50CWE-917Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-917.

Summary

A Server-Side Template Injection was identified in Apache Syncope prior to 2.1.6 enabling attackers to inject arbitrary Java EL expressions, leading to an unauthenticated Remote Code Execution (RCE) vulnerability. Apache Syncope uses Java Bean Validation (JSR 380) custom constraint validators. When building custom constraint violation error messages, they support different types of interpolation, including Java EL expressions. Therefore, if an attacker can inject arbitrary data in the error message template being passed, they will be able to run arbitrary Java code.

Why it matters now

EPSS 0.04982 92nd percentileScored 2026-11-07
Fix Fixed org.apache.syncope:syncope-core (Maven): 2.1.6

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Apache SyncopeApache Syncope 2.1.X releases prior to 2.1.6—No fix listedCNA
—org.apache.syncope:syncope-core (Maven)before 2.1.62.1.6Patch availableGHSA-vjqw-r3ww-wj2w
  • Apache Syncope Vendor— Affected Apache Syncope 2.1.X releases prior to 2.1.6 Fixed in — No fix listed CNA
  • org.apache.syncope:syncope-core (Maven) Vendor— Affected before 2.1.6 Fixed in 2.1.6 Patch available GHSA-vjqw-r3ww-wj2w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:*2.1.0 to before 2.1.6VulnerableApache
  • cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:* Versions 2.1.0 to before 2.1.6 Vulnerable ·Apache

Remediation

  • Fix · GHSA-vjqw-r3ww-wj2w org.apache.syncope:syncope-core (Maven) Fixed in 2.1.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1959
  2. 2026-10-03 Alias added: GHSA-vjqw-r3ww-wj2w

References

Advisory 2

  • TI-2025-35632 Apache Syncope: Remote Code Execution by delegated administrators CVSS 3.1HIGH 7.2
  • TI-2026-38503 Apache Syncope: Remote Code Execution via Scripted Connector CVSS 3.1CRITICAL 9.8
  • TI-2026-45025 Apache Syncope: RCE via Groovy Sandbox bypass CVSS 3.1CRITICAL 9.8
  • TI-2026-44406 Apache Syncope: User self-service privilege escalation CVSS 3.1CRITICAL 9.8
  • TI-2026-41245 Apache Syncope: SQL injection vulnerability in Audit Events search CVSS 3.1CRITICAL 9.8
  • TI-2026-38491 Apache Syncope: Remote Code Execution via Flowable BPMN Groovy ScriptTask CVSS 3.1CRITICAL 9.8
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences