CVE-2021-34658

MediumCVSS 6.1/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
Simple Popup Newsletter	Simple Popup Newsletter	>= 1.4.7, <= 1.4.7

References

https://plugins.trac.wordpress.org/browser/simple-popup-newsletter/trunk/simple-popup-newsletter.php#L319Exploit, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34658Exploit, Third Party Advisory
https://plugins.trac.wordpress.org/browser/simple-popup-newsletter/trunk/simple-popup-newsletter.php#L319Exploit, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34658Exploit, Third Party Advisory

Timeline

Published: Aug 16, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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