What is CVE-2020-18890?

CVE-2020-18890 is a critical-severity vulnerability in Puppycms, classified under Improper Preservation of Permissions. CVSS score: 9.8/10. Published 2021-05-06.

How severe is CVE-2020-18890?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Puppycms

CVE-2020-18890

Rmote Code Execution (RCE) vulnerability in puppyCMS v5.1 due to insecure permissions, which could let a remote malicious user getshell via /admin/functions.php.

Published 2021-05-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Puppycms — versions 5.1

Weakness classification (CWE)

CWE-281 — Improper Preservation of Permissions

References

github.com/choregus/puppyCMS/issues/14 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-18890?: CVE-2020-18890 is a critical-severity vulnerability in Puppycms, classified under Improper Preservation of Permissions. CVSS score: 9.8/10. Published 2021-05-06.
How severe is CVE-2020-18890?: Critical severity. CVSS v3 base score is 9.8 out of 10.