CVE-2026-4131 json
WP Responsive Popup + Optin <= 1.4 - Cross-Site Request Forgery to Stored Cross-Site Scripting via 'wpo_image_url' Parameter
published 2026-04-22 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-24672
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 7%
- public exploits
- 0
- none known
Summary
The WP Responsive Popup + Optin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.4. This is due to the settings form on the admin page (wpo_admin_page.php) lacking nonce generation (wp_nonce_field) and verification (wp_verify_nonce/check_admin_referer). This makes it possible for unauthenticated attackers to update all plugin settings including the 'wpo_image_url' parameter via a forged request, granted they can trick a site administrator into performing an action such as clicking a link.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- sphex1987 WP Responsive Popup + Optin
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/0a8a49c4-21e8-447c-94da-8241c7d66c29?source=cve
- plugins.trac.wordpress.org /browser/wp-popup-optin/trunk/wpo_admin_page.php#L103
- plugins.trac.wordpress.org /browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L103
- plugins.trac.wordpress.org /browser/wp-popup-optin/trunk/wpo_admin_page.php#L104
- plugins.trac.wordpress.org /browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L104
- plugins.trac.wordpress.org /browser/wp-popup-optin/trunk/wp-popup-optin.php#L218
- plugins.trac.wordpress.org /browser/wp-popup-optin/tags/1.4/wp-popup-optin.php#L218
- plugins.trac.wordpress.org /browser/wp-popup-optin/trunk/wpo_admin_page.php#L15
- plugins.trac.wordpress.org /browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L15
- plugins.trac.wordpress.org /browser/wp-popup-optin/trunk/wpo_admin_page.php#L43
- plugins.trac.wordpress.org /browser/wp-popup-optin/tags/1.4/wpo_admin_page.php#L43
Sources
- CVE List CVE-2026-4131
- NVD CVE-2026-4131
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.