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    CVE-2025-66592

    An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

    Published:May 27, 2026
    Last Modified:Jun 2, 2026
    EPS:May 27, 2026
    EPSS Score:0.00004
    CVSS Score:6.1

    Affected Products

    Vendor
    Synology
    Product
    Active Backup For Business Agent

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-346 Origin Validation Error

    Related CVEs

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    CVE-2024-47264 (CVSS 4.9) — Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in agent-related …
    CVE-2023-52949 (CVSS 5.5) — Missing authentication for critical function vulnerability in proxy settings functionality in Synology Active …
    CVE-2023-52948 (CVSS 5) — Missing encryption of sensitive data vulnerability in settings functionality in Synology Active Backup for Bus…
    CVE-2023-52947 (CVSS 4) — Missing authentication for critical function vulnerability in logout functionality in Synology Active Backup f…
    CVE-2023-52950 (CVSS 5.3) — Missing encryption of sensitive data vulnerability in login component in Synology Active Backup for Business A…

    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