CVE-2017-20207

Flickr Gallery <= 1.5.2 - Unauthenticated PHP Object Injection

Published Oct 18, 2025 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Dancoulter
Dancoulter flickr Gallery
CPEs cpe:2.3:a:dancoulter:flickr_gallery:*:*:*:*:*:wordpress:*:*
Vendors & Products Dancoulter
Dancoulter flickr Gallery
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Dan Coulter
Dan Coulter flickr Gallery
Wordpress
Wordpress wordpress
Vendors & Products Dan Coulter
Dan Coulter flickr Gallery
Wordpress
Wordpress wordpress
Type Values Removed Values Added
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.
Title Flickr Gallery <= 1.5.2 - Unauthenticated PHP Object Injection
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Wordfence
Published
Updated
Apr 8, 2026, 5:17 PM
Reserved
Oct 17, 2025, 3:00 PM
Status
Analyzed
Published
Oct 18, 2025, 4:15 AM
Modified
Jun 17, 2026, 1:15 AM