CVE-2026-15759 json
ChatHelp <= 3.5.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes
published 2026-07-17 3 mo ago modified 2026-07-17 3 mo ago also EUVD-2026-45135
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- themeatelier ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/c3ec4978-0d51-4ca1-b0cf-81aaa4d43f7b?source=cve
- plugins.trac.wordpress.org /browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomButtonsTemplates.php#L76
- plugins.trac.wordpress.org /browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomButtonsTemplates.php#L66
- plugins.trac.wordpress.org /browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomButtonsTemplates.php#L138
- plugins.trac.wordpress.org /browser/chat-help/tags/3.5.1/src/Frontend/Shortcode/CustomShortcode.php#L38
- plugins.trac.wordpress.org /browser/chat-help/tags/3.5.1/src/Includes/ChatHelp.php#L192
- plugins.trac.wordpress.org /changeset?reponame=&old=3609732%40chat-help&new=3609732%40chat-help
Sources
- CVE List CVE-2026-15759
- NVD CVE-2026-15759
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.