What is CVE-2018-20594?

CVE-2018-20594 is a medium-severity vulnerability in Hsweb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-30.

How severe is CVE-2018-20594?

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

XSS in Hsweb

CVE-2018-20594

An issue was discovered in hsweb 3.0.4. It is a reflected XSS vulnerability due to the absence of type parameter checking in FlowableModelManagerController.java.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Hsweb — versions 3.0.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/hs-web/hsweb-framework/commit/b72a2275ed21240296c6539bae1049c56abb54… (Patch, Third Party Advisory)
github.com/hs-web/hsweb-framework/issues/107 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-20594?: CVE-2018-20594 is a medium-severity vulnerability in Hsweb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-30.
How severe is CVE-2018-20594?: Medium severity. CVSS v3 base score is 6.1 out of 10.