What is the CVSS score of EUVD-2026-45135?

EUVD-2026-45135 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.2%.

ChatHelp WordPress Plugin EUVD-2026-45135

| CVE-2026-15759 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-07-17 Wordfence

GHSA-m8qm-p7f3-7xr7

WordPress XSS Wordpress Plugin Chathelp Click To Chat Button Woocommerce Chat To Order Floating Chat Form Themeatelier

6.4

CVSS 3.1 · Vendor: Wordfence

Severity by source

Vendor (Wordfence) PRIMARY

6.4 MEDIUM

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

vuln.today AI

5.4 MEDIUM

Stored XSS requires victim to load injected page (UI:R); contributor auth required (PR:L); scope changes to victim browser (S:C); no server availability impact.

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

4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Wordfence).

CVSS VectorVendor: Wordfence

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Jul 17, 2026 - 05:17 vuln.today

CVE Published

Jul 17, 2026 - 03:43 cve.org

MEDIUM 6.4

DescriptionCVE.org

The ChatHelp - Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes in all versions up to, and including, 3.5.1 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.

AnalysisAI

Stored Cross-Site Scripting in the ChatHelp plugin for WordPress (versions through 3.5.1) allows authenticated attackers with contributor-level access to inject persistent malicious scripts via the 'number' and 'group' shortcode attributes, which execute in victims' browsers on page load. The vulnerability stems from insufficient input sanitization and output escaping in the shortcode rendering layer, identified across multiple source files in CustomButtonsTemplates.php and CustomShortcode.php. No public exploit code has been identified at time of analysis, and the plugin is not listed in CISA KEV; however, Wordfence has published a threat intelligence entry and a patch changeset exists in the WordPress plugin repository.

Technical ContextAI

The affected product is the 'ChatHelp - Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form' WordPress plugin by ThemeAtelier, identified by CPE cpe:2.3:a:themeatelier:chathelp_-_click_to_chat_button,_woocommerce_chat_to_order_&_floating_chat_form:*:*:*:*:*:*:*:*. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-Site Scripting), a classic output encoding failure. The flaw resides in the WordPress shortcode rendering pipeline: when a contributor or higher inserts shortcodes using 'number' or 'group' attributes, the values flow directly into HTML output without sanitization. Source-level references point to CustomButtonsTemplates.php (lines 66, 76, 138), CustomShortcode.php (line 38), and ChatHelp.php (line 192) in tag 3.5.1, confirming the vulnerability surface spans both the template rendering and the shortcode registration layers. WordPress shortcodes are rendered server-side and their output is embedded verbatim into page HTML, making this a server-stored, client-executed injection path under CWE-79.

RemediationAI

An upstream fix is available in the WordPress plugin repository as changeset 3609732 (https://plugins.trac.wordpress.org/changeset?reponame=&old=3609732%40chat-help&new=3609732%40chat-help); however, the exact patched release version number is not independently confirmed from the available data - administrators should update to the latest available version of ChatHelp in the WordPress plugin dashboard and verify the installed version exceeds 3.5.1. As an interim compensating control, restrict contributor-level role assignments to trusted users only, since exploitation is gated on PR:L authenticated access. Sites with open user registration should consider disabling self-registration or elevating the minimum role required to use shortcodes via a plugin such as Shortcodes Ultimate Permissions. Disabling the specific 'number' and 'group' shortcode attributes via a WAF rule targeting chat-help shortcode patterns is an additional option but may break plugin functionality. Monitor the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/c3ec4978-0d51-4ca1-b0cf-81aaa4d43f7b for confirmed fixed version details.