What is CVE-2020-21366?

CVE-2020-21366 is a high-severity vulnerability in Njtech Greencms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.0/10. Published 2023-06-20.

How severe is CVE-2020-21366?

High severity. CVSS v3 base score is 8.0 out of 10.

CSRF in Njtech Greencms

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.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2023-06-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Njtech Greencms — versions 2.3

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/GreenCMS/GreenCMS/issues/115 (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2020-21366?: CVE-2020-21366 is a high-severity vulnerability in Njtech Greencms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.0/10. Published 2023-06-20.
How severe is CVE-2020-21366?: High severity. CVSS v3 base score is 8.0 out of 10.