CVE-2026-42782
Published: 25 May 2026
Summary
CVE-2026-42782 is a high-severity Improper Isolation or Compartmentalization (CWE-653) vulnerability in Apache Syncope. Its CVSS base score is 7.2 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 46.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-31696
Vulnerability details
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…
more
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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vulnerability enables unsandboxed Groovy script execution by admins, directly mapping to public-facing app exploitation (T1190) and command/scripting interpreter abuse (T1059).
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Defines isolation boundaries by specifying which external systems may access or process organization data.
Maintains isolation and compartmentalization by restricting flows between security domains or levels.
Reviewing the continued need for connections supports isolation and compartmentalization.
Locating systems away from hazards improves isolation and compartmentalization from external physical or environmental threats.
The CONOPS must articulate isolation and compartmentalization expectations for security and privacy, making architectural failures in separation of duties or domains harder to overlook.
Security architectures commonly incorporate isolation and compartmentalization strategies to limit the impact of compromises.
Organization-wide privacy program leadership ensures proper isolation and compartmentalization of personal data.
Oversight ensures data-matching activities maintain required isolation between distinct data sets and authorized user communities.