Medium severity6.1NVD Advisory· Published Aug 16, 2021· Updated Jun 17, 2026No known patch
CVE-2021-34658
No known patch is available for this vulnerability.
The affected plugin has been removed from the WordPress.org directory (reason: Security Issue), and no patched version is being distributed through the official directory. If you have the affected software installed, you should uninstall or replace it rather than wait for an update.
CVE-2021-34658
Description
The Simple Popup Newsletter WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/simple-popup-newsletter.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.4.7.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: <=1.4.7
- Simple Popup Newsletter/Simple Popup Newsletterv5Range: 1.4.7
Patches
Vulnerability mechanics
References
2- plugins.trac.wordpress.org/browser/simple-popup-newsletter/trunk/simple-popup-newsletter.phpnvdExploitThird Party Advisory
- www.wordfence.com/vulnerability-advisories/nvdExploitThird Party Advisory
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