TI-2021-13672 Aliases CVE-2021-34658 GHSA-3ffg-w27c-62q6

Simple Popup Newsletter <= 1.4.7 Reflected Cross-Site Scripting

LOW 29CWE-79Published 2021-08-16 · Updated 2025-05-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00895 59th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Simple Popup Newsletter	Simple Popup Newsletter	1.4.7 – 1.4.7	—	No fix listed	CNA

Simple Popup Newsletter VendorSimple Popup Newsletter Affected 1.4.7 – 1.4.7 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:keszites:simple_popup_newsletter::::::wordpress::*	up to 1.4.7	Vulnerable	Keszites

cpe:2.3:a:keszites:simple_popup_newsletter:*:*:*:*:*:wordpress:*:* Versions up to 1.4.7 Vulnerable ·Keszites

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-34658
2026-10-03 Alias added: GHSA-3ffg-w27c-62q6

References

Exploit 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences