CVE-2017-20207
published 2025-10-18CVE-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…
PriorityP183critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
ITWVulnCheck KEV
Exploited in the wild
EPSS
0.67%
47.3th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dan_coulter | flickr_gallery | < 1.5.3 | 1.5.3 |
| dancoulter | flickr_gallery | <= 1.5.2 | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vulncheck9.8CRITICAL
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GHSA
GHSA-vv63-gqpw-3x4p: The Flickr Gallery plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 1
ghsa_unreviewed·2025-10-18
CVE-2017-20207 [CRITICAL] CWE-502 GHSA-vv63-gqpw-3x4p: The Flickr Gallery plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 1
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.
VulnCheck
dancoulter flickr_gallery Deserialization of Untrusted Data
vulncheck·2017·CVSS 9.8
CVE-2017-20207 [CRITICAL] dancoulter flickr_gallery Deserialization of Untrusted Data
dancoulter flickr_gallery Deserialization of Untrusted Data
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.
Affected: Dan Coulter Flickr Gallery Plugin for WordPress
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/; https://www.cve.org/cverecord?id=CVE-2017-20207
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-10-18
Published
Exploited in the wild