CVE-2021-34658
Last modified
CVE-2021-34658 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.90% chance of exploitation in the next 30 days.
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/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Keszites | Simple Popup Newsletter | <= 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
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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