What is CVE-2020-18178?

CVE-2020-18178 is a critical-severity vulnerability in Hongcms Project, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-05-18.

How severe is CVE-2020-18178?

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

Path Traversal in Hongcms Project

CVE-2020-18178

Path Traversal in HongCMS v4.0.0 allows remote attackers to view, edit, and delete arbitrary files via a crafted POST request to the component "/hcms/admin/index.php/language/ajax."

Vulnerability class: Path Traversal (Directory Traversal)

Published 2021-05-18 · 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: 0.017 (77.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Hongcms Project — versions 4.0.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/Neeke/HongCMS/issues/11 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-18178?: CVE-2020-18178 is a critical-severity vulnerability in Hongcms Project, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-05-18.
How severe is CVE-2020-18178?: Critical severity. CVSS v3 base score is 9.8 out of 10.