CVE-2020-23839

Name: CVE-2020-23839
Creator: NVD / NIST
Published: 2020-09-01T17:15:12.31+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 10.46%

Last modified Jun 17, 2026

CVE-2020-23839 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A Reflected Cross-Site Scripting (XSS) vulnerability in GetSimple CMS v3.3.16, in the admin/index.php login portal webpage, allows remote attackers to execute JavaScript code in the client's browser and harvest login credentials after a client clicks a link, enters credentials, and submits the login form.. EPSS estimates a 10.46% chance of exploitation in the next 30 days.

Description

A Reflected Cross-Site Scripting (XSS) vulnerability in GetSimple CMS v3.3.16, in the admin/index.php login portal webpage, allows remote attackers to execute JavaScript code in the client's browser and harvest login credentials after a client clicks a link, enters credentials, and submits the login form.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

10.46%

95.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Get-Simple	Getsimple Cms	3.3.16

References

http://packetstormsecurity.com/files/162016/GetSimple-CMS-3.3.16-Cross-Site-Scripting-Shell-Upload.htmlThird Party Advisory, VDB Entry
https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1330Exploit, Third Party Advisory
https://github.com/boku7/CVE-2020-23839Third Party Advisory
https://www.exploit-db.com/exploits/49726Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/162016/GetSimple-CMS-3.3.16-Cross-Site-Scripting-Shell-Upload.htmlThird Party Advisory, VDB Entry
https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1330Exploit, Third Party Advisory
https://github.com/boku7/CVE-2020-23839Third Party Advisory
https://www.exploit-db.com/exploits/49726Third Party Advisory, VDB Entry

Timeline

Published: Sep 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-23839?

How severe is CVE-2020-23839?

CVE-2020-23839 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 10.46% probability of exploitation in the next 30 days.

How do I fix CVE-2020-23839?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-23839?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST