What is CVE-2021-34658?

CVE-2021-34658 is a medium-severity vulnerability in Keszites Simple Popup Newsletter, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-16.

How severe is CVE-2021-34658?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-34658 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Keszites Simple Popup Newsletter

CVE-2021-34658

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.009 (56.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Keszites Simple_popup_newsletter
Simple Popup Newsletter — versions 1.4.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

security@wordfence.com (Exploit, Third Party Advisory, x_refsource_MISC)
security@wordfence.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-34658?: CVE-2021-34658 is a medium-severity vulnerability in Keszites Simple Popup Newsletter, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-16.
How severe is CVE-2021-34658?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-34658 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.