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    CVE-2017-20207

    The Flickr Gallery plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 1.5.2 via deserialization of untrusted input from the `pager ` parameter. This allows unauthenticated attackers to inject a PHP Object. Attackers were actively exploiting this vulnerability with the WP_Theme() class to create backdoors.

    Published:Oct 18, 2025
    Last Modified:Apr 8, 2026
    EPS:Oct 18, 2025
    EPSS Score:0.00541
    CVSS Score:9.8

    Affected Products

    Vendor
    Dan Coulter
    Product
    Flickr Gallery
    Vendor
    Dancoulter
    Product
    Flickr Gallery
    Vendor
    Wordpress
    Product
    Wordpress

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

    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