What the vulnerability does
01Description
The Speed Optimizer – The All-In-One Performance-Boosting Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Image Tag Attributes in all versions up to, and including, 7.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the site administrator has enabled the Lazy Load Media option in the plugin settings.
Explanation of Vulnerability in Simple Terms
02Summary
The Speed Optimizer plugin for WordPress contains a stored cross-site scripting (XSS) vulnerability in versions up to 7.8.0. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors, potentially compromising their sessions or stealing sensitive data. The vulnerability affects the entire site scope due to how the plugin processes and displays user-controlled input.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers and steal their session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Visitors and administrators may have their sessions hijacked or be redirected to malicious sites; site reputation and user trust can be damaged.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress account (e.g., subscriber or contributor role) and network access to the site.
Key dates
06Disclosure timeline
August 19, 2026
CVE published
