Apache Syncope 3.0-4.1.0: Improper Isolation via Groovy Static Init (fixed 4.1.1)
CVE-2026-42782 Published on May 25, 2026
Apache Syncope: Post-auth RCE via Groovy static
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.
Vulnerability Analysis
CVE-2026-42782 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Separation of Privilege Vulnerability?
The product does not sufficiently compartmentalize functionality or processes that require different privilege levels, rights, or permissions. When a weakness occurs in functionality that is accessible by lower-privileged users, then without strong boundaries, an attack might extend the scope of the damage to higher-privileged users.
CVE-2026-42782 has been classified to as a Separation of Privilege vulnerability or weakness.
Products Associated with CVE-2026-42782
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Affected Versions
Apache Software Foundation Apache Syncope:- Version 3.0, <= 3.0.16 is affected.
- Version 4.0, <= 4.0.5 is affected.
- Version 4.1, <= 4.1.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.