What is CVE-2020-21386?

CVE-2020-21386 is a high-severity vulnerability in Maccms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-10-04.

How severe is CVE-2020-21386?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Maccms

CVE-2020-21386

A Cross-Site Request Forgery (CSRF) in the component admin.php/admin/type/info.html of Maccms 10 allows attackers to gain administrator privileges.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Maccms — versions 10.0

Weakness classification (CWE)

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

References

github.com/magicblack/maccms10/issues/126 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21386?: CVE-2020-21386 is a high-severity vulnerability in Maccms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-10-04.
How severe is CVE-2020-21386?: High severity. CVSS v3 base score is 8.8 out of 10.