CVE-2017-20207

CRITICAL 9.8CVE-2017-20207 · Published 18/10/2025 · updated 17/06/2026

Package	Affected versions	Patched versions
flickr gallery dancoulter	`≤ 1.5.2`	No fix yet

Description

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.

References

plugins.trac.wordpress.org/changeset/1737576/flickr-gallery · Patch
wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild · Press/Media Coverage
wordfence.com/threat-intel/vulnerabilities/id/b52ae51d-7b9a-4047-82bf-723ea87d2375 · Third Party Advisory

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