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Vulnerability record · CVE-2017-20207 · published 18 October 2025

CVE-2017-20207: Dancoulter flickr gallery deserialization of untrusted data vulnerability

DDancoulter · Flickr Gallery

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.

9.8 CVSS 3.1 Critical EPSS 0.74% · top 47.4% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.1 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2017-20207), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.