CVE-2026-42782: Apache Syncope: Post-auth RCE via Groovy static

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-25 · updated 2026-07-24
Weakness: CWE-653

Description

Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements for Implementations can create a malicious Groovy class containing untrusted code reaching a non-sandboxed execution path via the class static initializer. This issue affects Apache Syncope: 3.0 through 3.0.16, 4.0 through 4.0.5, 4.1.0. Users are recommended to upgrade to version 4.0.6 / 4.1.1, which fix this issue by forcing even the static initializer in Groovy code to run in a sandbox.

Affected products

Apache Software Foundation Apache Syncope: from 3.0.0 through 3.0.16; from 4.0.0 before 4.0.6; 4.1.0 — fixed in 4.0.6

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Syncope 4.0.6. Check the vendor advisory for mitigations.

References

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