What the vulnerability does
01Description
The Responsive Lightbox & Gallery plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 2.7.1. This is due to the use of `strpos()` for substring-based hostname validation instead of strict host comparison in the `ajax_upload_image()` function. This makes it possible for authenticated attackers, with Author-level access and above, to make web requests to arbitrary locations originating from the web application, which can be used to query and modify information from internal services.
Explanation of Vulnerability in Simple Terms
02Summary
Responsive Lightbox & Gallery versions 2.7.1 and earlier contain a server-side request forgery vulnerability. An authenticated user with low privileges can make the site send HTTP requests to internal or external systems on the attacker's behalf. The scope is changed, meaning the impact may extend beyond the plugin itself. Confidentiality is at low risk.
What an attacker can do
03Attacker Capabilities
Make the site send HTTP requests to internal systems or external URLs under the attacker's control.
Potential impact on your site
04Site Impact
An authenticated attacker can probe your internal network, access internal services, or trigger actions on external systems via your site.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site (e.g., subscriber or contributor role).
Key dates
06Disclosure timeline
February 25, 2026
CVE published
April 8, 2026
Record updated
