What the vulnerability does
01Description
The Post Blocks & Tools plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'sliderStyle' block attribute in the Posts Slider block in all versions up to, and including, 1.3.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Post Blocks & Tools versions 1.3.0 and earlier contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors, potentially stealing session tokens or performing actions on their behalf. The vulnerability affects the entire site scope due to how the vulnerable component processes user 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 as them.
Potential impact on your site
04Site Impact
Authenticated users can inject persistent malicious code affecting all site visitors, compromising user sessions and data.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege authenticated account on the site.
Key dates
06Disclosure timeline
April 8, 2026
CVE published
April 9, 2026
Record updated
