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CVE-2026-42782 Apache Software Foundation CVE debrief

Apache Syncope versions 3.0 through 3.0.16, 4.0 through 4.0.5, and 4.1.0 contain an improper isolation or compartmentalization vulnerability (CWE-653). An administrator with sufficient entitlements for Implementations can create a malicious Groovy class containing untrusted code that reaches a non-sandboxed execution path via the class static initializer. The vulnerability was published on 2026-05-25 and modified on 2026-05-26. Apache has released fixes in versions 4.0.6 and 4.1.1, which force even the static initializer in Groovy code to run in a sandbox.

Vendor
Apache Software Foundation
Product
Apache Syncope
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-25
Original CVE updated
2026-07-24
Advisory published
2026-05-25
Advisory updated
2026-07-24

Who should care

Organizations running Apache Syncope for identity management and access governance, particularly those with delegated administrative capabilities for Implementations. Security teams responsible for code execution sandboxing in Java/Groovy environments. Compliance officers tracking improper isolation vulnerabilities in identity infrastructure.

Technical summary

The vulnerability exists in Apache Syncope's Groovy implementation handling. When an administrator with Implementations entitlements creates a Groovy class, the static initializer (a block of code that runs when the class is loaded) executes outside the intended sandbox restrictions. This allows arbitrary code execution with elevated privileges. The fix enforces sandbox restrictions on static initializers, ensuring all Groovy code execution paths are properly isolated.

Defensive priority

high

Recommended defensive actions

  • Upgrade Apache Syncope to version 4.0.6 or 4.1.1 to remediate this vulnerability
  • Review administrator entitlements for Implementations to ensure principle of least privilege
  • Audit existing Groovy implementations for unauthorized or suspicious class definitions
  • Monitor Apache security advisories for additional guidance

Evidence notes

The vulnerability description is sourced from the official CVE record and NVD entry. Affected version ranges and remediation guidance are explicitly stated in the CVE description. The weakness classification (CWE-653) is attributed to [email protected] as a secondary source. Vendor identification as 'Apache' is derived from reference domain analysis with low confidence and requires review.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42782 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42782

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42782 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42782

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.