What is CVE-2020-17551?

CVE-2020-17551 is a medium-severity vulnerability in Impresscms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2020-10-07.

How severe is CVE-2020-17551?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Impresscms

CVE-2020-17551

ImpressCMS 1.4.0 is affected by XSS in modules/system/admin.php which may result in arbitrary remote code execution.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (65.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Impresscms — versions 1.4.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.impresscms.org/ (Product)
github.com/ImpressCMS/impresscms/issues/659 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2020-17551?: CVE-2020-17551 is a medium-severity vulnerability in Impresscms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2020-10-07.
How severe is CVE-2020-17551?: Medium severity. CVSS v3 base score is 4.8 out of 10.