CVE-2017-20207CWE-502

Flickr Gallery <= 1.5.2 - Unauthenticated PHP Object Injection

Critical · published October 18, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
53.6
In the wild
Unconfirmed
What it is

🚨 A sneaky PHP Object Injection vulnerability lurks in the Flickr Gallery plugin for WordPress, allowing attackers to craft untrusted input and create potential backdoors! 🔥 Imagine a restaurant that allows patrons to submit their own recipes without checking for allergens. One rogue customer could slip in something nasty, and suddenly the entire kitchen is compromised! 🍽️ If exploited, an attacker could inject malicious PHP objects, gaining unauthorized access to your WordPress site and potentially wreaking havoc — think stolen data, unauthorized changes, or even total control of your website! This is absolutely devastating for anyone relying on the affected plugin.

Put simply

Imagine a restaurant that allows patrons to submit their own recipes without checking for allergens. One rogue customer could slip in something nasty, and suddenly the entire kitchen is compromised! 🍽️ The vulnerability arises from the deserialization of untrusted input via the `pager` parameter in versions up to 1.5.2, allowing unauthenticated users to execute arbitrary PHP code with the targeted WP_Theme() class.

What to do

If exploited, an attacker could inject malicious PHP objects, gaining unauthorized access to your WordPress site and potentially wreaking havoc — think stolen data, unauthorized changes, or even total control of your website! This is absolutely devastating for anyone relying on the affected plugin. Update the Flickr Gallery plugin immediately to version 1.5.3 or later to patch this vulnerability. Additionally, review any instances of untrusted data being deserialized in your code as a precaution against similar exploits. You've got this! With a quick update, you'll be bolstering your defenses and keeping those pesky attackers at bay! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00735 · 53.6th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2025-10-18T03:33Z
EPSS history
Timeline
  • 18 OCT 03:33Z
    Flickr Gallery <= 1.5.2 - Unauthenticated PHP Object Injection
    cvelistv5