Medium severity · published Jul 17, 2026
CVE-2026-15759
ChatHelp <= 3.5.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes
6.4
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form · themeatelier
through 3.5.1 · source: vendor
Affected product
CC
ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form
themeatelier
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15759
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15759
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomButtonsTemplates.php#L138
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomButtonsTemplates.php#L66
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomButtonsTemplates.php#L76
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomShortcode.php#L38
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/chat-help/tags/3.5.1/src/Includes/ChatHelp.php#L192
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset?reponame=&old=3609732%40chat-help&new=3609732%40chat-help
More from ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form
7.5
CVE-2026-15291
Chat Help – Click to Chat Button & Form <= 3.1.3 - Missing Authorization to Unauthenticated Sensitive Information Exposure