CVE-2025-23578

WordPress Custom CSS Addons plugin <= 1.9.1 - Reflected Cross Site Scripting (XSS) vulnerability

Published Jan 22, 2025 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Bastien Ho Custom CSS Addons css-addons allows Reflected XSS.This issue affects Custom CSS Addons: from n/a through <= 1.9.1.

Analysis

Technical impact

The vulnerability is a reflected cross‑site scripting flaw that allows an attacker to inject arbitrary JavaScript into a page served by the Custom CSS Addons plugin. The injected code runs in the victim’s browser, potentially exfiltrating cookies, hijacking sessions, or defacing the site. This flaw is classified as CWE‑79 and can be particularly dangerous for visitors who authenticate or interact with sensitive content on the website.

Affected Systems

Bastien Ho Custom CSS Addons for WordPress, versions up to and including 1.9.1 (the starting version is not specified in the CVE), are affected. Any site running the plugin at version 1.9.1 or earlier is vulnerable.

Risk and Exploitability

The CVSS score of 7.1 reflects a moderate to high risk, while the EPSS score of less than 1% indicates a low probability of observed exploitation. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is inferred from the plugin’s handling of user‑supplied input, such as settings fields or query parameters, which the plugin does not sanitize. An attacker could craft a malicious URL or form submission that, when viewed by a user, executes the injected script.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Bastien Ho

Custom CSS Addons

unaffected

Version	Status	Constraints
`0`	affected	≤ 1.9.1

No data.

Vendor	Product	Versions
Wordpress	Wordpress	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the Custom CSS Addons plugin to the latest released version that removes the reflected XSS flaw.
If an upgrade is not immediately possible, temporarily disable or delete the plugin from the WordPress installation to eliminate the vulnerable code path.
Deploy a web application firewall rule or enforce a strict Content Security Policy that blocks reflected XSS payloads for the affected site.

Generated by OpenCVE AI on May 2, 2026 at 09:34 UTC.

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-3260	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound Custom CSS Addons allows Reflected XSS. This issue affects Custom CSS Addons: from n/a through 1.9.1.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.409% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://patchstack.com/database/Wordpress/Plugin/css-addons/vulnerability/wordpress-custom-css-addons-plugin-1-9-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve

History

Apr 23, 2026 3:00 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L'}`

Apr 1, 2026 11:45 PM Description updated. References updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound Custom CSS Addons allows Reflected XSS. This issue affects Custom CSS Addons: from n/a through 1.9.1.	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Bastien Ho Custom CSS Addons css-addons allows Reflected XSS.This issue affects Custom CSS Addons: from n/a through <= 1.9.1.
References	https://patchstack.com/database/wordpress/plugin/css-addons/vulnerability/wordpress-custom-css-addons-plugin-1-9-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve	https://patchstack.com/database/Wordpress/Plugin/css-addons/vulnerability/wordpress-custom-css-addons-plugin-1-9-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
Metrics	cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L'}`

Jan 22, 2025 8:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jan 22, 2025 2:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound Custom CSS Addons allows Reflected XSS. This issue affects Custom CSS Addons: from n/a through 1.9.1.
Title		WordPress Custom CSS Addons plugin <= 1.9.1 - Reflected Cross Site Scripting (XSS) vulnerability
Weaknesses		CWE-79
References		https://patchstack.com/database/wordpress/plugin/css-addons/vulnerability/wordpress-custom-css-addons-plugin-1-9-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
Metrics		cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L'}`