What is CVE-2018-20595?

CVE-2018-20595 is a high-severity vulnerability in Hsweb, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2018-12-30.

How severe is CVE-2018-20595?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Hsweb

CVE-2018-20595

A CSRF issue was discovered in web/authorization/oauth2/controller/OAuth2ClientController.java in hsweb 3.0.4 because the state parameter in the request is not compared with the state parameter in the session after user authentication is successful.

Vulnerability class: CSRF (Cross-Site Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Hsweb — versions 3.0.4

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/hs-web/hsweb-framework/commit/40929e9b0d336a26281a5ed2e0e721d54dd8d2… (Patch, Third Party Advisory)
github.com/hs-web/hsweb-framework/issues/107 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-20595?: CVE-2018-20595 is a high-severity vulnerability in Hsweb, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2018-12-30.
How severe is CVE-2018-20595?: High severity. CVSS v3 base score is 8.8 out of 10.