CVE-2023-23995 MEDIUM

CVE-2023-23995: WordPress TinyMCE Custom Styles Plugin <= 1.1.2 is vulnerable to Cross Site Scripting (XSS)

Vendor Tim Reeves & David Stöckl
Product TinyMCE Custom Styles
Weakness CWE-79 · XSS
Published April 25, 2023
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Tim Reeves & David Stöckl TinyMCE Custom Styles plugin <= 1.1.2 versions.

Explanation of Vulnerability in Simple Terms

02Summary

TinyMCE Custom Styles versions up to 1.1.2 contain a cross-site scripting (XSS) vulnerability in how custom styles are processed. An authenticated user with high privileges can inject malicious scripts that execute in the browser of another user who views the affected content. The vulnerability requires user interaction and can affect the confidentiality, integrity, and availability of the site.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that run in other users' browsers when they view custom styles.

Potential impact on your site

04Site Impact

Authenticated admins can inject scripts affecting other users' sessions, potentially compromising accounts or site data.

Conditions required to exploit

05Prerequisites

Attacker must have high-level admin privileges and the victim must view a page containing the malicious custom style.

Key dates

06Disclosure timeline

April 25, 2023 CVE published
April 28, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2026-15016 Paid Memberships Pro – Content Restriction, User Registration, & Paid Subscriptions <= 3.8.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting CVE-2026-15648 Brands for WooCommerce <= 3.8.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'width' Shortcode Attribute CVE-2026-65762 Joomla Extension - phoca.cz - Reflected XSS vulnerability in Phoca Guestbook 5.0.0-6.1.0 CVE-2026-15644 Powerkit <= 3.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'style' Shortcode Attribute CVE-2025-9205 MapSVG Lite <= 8.14.0 - Authenticated (Contributor+) Stored Cross-Site Scripting