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CVE-2021-34658

MEDIUM 6.1 CVSS 3.1
Published
August 16, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Affected WordPress components

  • simple-popup-newsletter Plugin · simple-popup-newsletter
    Confirmed match Homeless
    From 1.4.7 (including) to 1.4.7 (including)
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Simple Popup Newsletter Simple Popup Newsletter — From 1.4.7 (including) to 1.4.7 (including)
  • keszites simple_popup_newsletter — Up to and including 1.4.7

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-popup-newsletter/trunk/simple-popup-newsletter.php#L319 Exploit, Third Party Advisory
  • www.wordfence.com https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34658 Exploit, Third Party Advisory
  • nvd.nist.gov Official NVD record