CVE-2017-20207

Flickr Gallery <= 1.5.2 - Unauthenticated PHP Object Injection

CVSS 9.8 CRITICALEPSS 0.7%CWE-502

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.8EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

18 Oct 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Dan Coulter · Flickr Gallery

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References

https://plugins.trac.wordpress.org/changeset/1737576/flickr-gallery https://www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/https://www.wordfence.com/threat-intel/vulnerabilities/id/b52ae51d-7b9a-4047-82bf-723ea87d2375?source=cve