CVE-2026-8873 MEDIUM

CVE-2026-8873: Content Slideshow <= 2.4.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Vendor Celloexpressions
Product Content Slideshow
Weakness CWE-79 · XSS
Published May 27, 2026
Last update May 27, 2026

CVSS base score

6.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

The Content Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 2.4.1 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.

Explanation of Vulnerability in Simple Terms

02Summary

Content Slideshow versions 2.4.1 and earlier contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has changed scope, meaning injected code can affect other users and site functionality beyond the vulnerable component. An attacker with low-level site access can craft malicious input that executes in other users' browsers.

What an attacker can do

03Attacker Capabilities

Inject JavaScript that runs in other users' browsers and affects site functionality.

Potential impact on your site

04Site Impact

Authenticated users with low privileges can inject scripts affecting other users and site behavior.

Conditions required to exploit

05Prerequisites

Attacker must have low-level authenticated access to the site; no user interaction required.

Key dates

06Disclosure timeline

May 27, 2026 CVE published
May 27, 2026 Record updated

Related vulnerabilities

08Related CVE