CVE-2020-21366

Name: CVE-2020-21366
Creator: NVD / NIST
Published: 2023-06-20T15:15:11.253+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2020-21366 is a high-severity vulnerability rated 8/10 on the CVSS scale. Cross Site Request Forgery vulnerability in GreenCMS v.2.3 allows an attacker to gain privileges via the adduser function of index.php.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

Cross Site Request Forgery vulnerability in GreenCMS v.2.3 allows an attacker to gain privileges via the adduser function of index.php.

Metrics

CVSS 3.1

8/10

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

EPSS Probability

0.33%

24.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Njtech	Greencms	2.3

References

https://github.com/GreenCMS/GreenCMS/issues/115Exploit, Issue Tracking
https://github.com/GreenCMS/GreenCMS/issues/115Exploit, Issue Tracking

Timeline

Published: Jun 20, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21366?

Cross Site Request Forgery vulnerability in GreenCMS v.2.3 allows an attacker to gain privileges via the adduser function of index.php.

How severe is CVE-2020-21366?

CVE-2020-21366 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21366?

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-2020-21366?

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

Scan your code now

Source: NVD / NIST