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    CVE-2026-53421

    Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements can achieve remote code execution through the connector subsystem by relying on scripted connectors' (REST and SQL) capability to run Groovy scripts. This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 4.1.1. Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by hardening the Groovy security sandbox.

    Published:Jul 20, 2026
    Last Modified:Jul 21, 2026
    EPS:Jul 20, 2026
    EPSS Score:0.00289
    CVSS Score:9.8

    Affected Products

    Vendor
    Apache
    Product
    Syncope

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-53405 (CVSS 9.8) — Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate en…
    CVE-2026-63071 (CVSS 9.8) — Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate en…
    CVE-2026-42797 (CVSS 4.9) — Exposure of Sensitive Information Through Data Queries vulnerability in Apache Syncope. An administrator with…
    CVE-2026-42782 (CVSS 7.2) — Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate en…
    CVE-2026-23794 (CVSS 6.8) — Reflected XSS in Apache Syncope's Enduser Login page. An attacker that tricks a legitimate user into clicking …
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High