What is CVE-2020-20426?

CVE-2020-20426 is a medium-severity vulnerability in S-Cms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-22.

How severe is CVE-2020-20426?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in S-Cms

CVE-2020-20426

S-CMS Government Station Building System v5.0 contains a cross-site scripting (XSS) vulnerability in /function/booksave.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-12-22 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

S-Cms — versions 5.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.s-cms.cn/ (Product)
af854a3a-2127-422b-91ae-364da2661108 (Not Applicable)
github.com/Sea0o/vulnerability/issues/2 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-20426?: CVE-2020-20426 is a medium-severity vulnerability in S-Cms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-12-22.
How severe is CVE-2020-20426?: Medium severity. CVSS v3 base score is 6.1 out of 10.