What is CVE-2018-9920?

CVE-2018-9920 is a medium-severity vulnerability in K2 Smartforms, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2018-05-24.

How severe is CVE-2018-9920?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in K2 Smartforms

CVE-2018-9920

Server side request forgery exists in the runtime application in K2 smartforms 4.6.11 via a modified hostname in an https://*/Identity/STS/Forms/Scripts URL.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2018-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.9th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000

Affected products

K2 Smartforms — versions 4.6.11

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

www.securityfocus.com/archive/1/542035/100/0/threaded (mailing-list, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2018-9920?: CVE-2018-9920 is a medium-severity vulnerability in K2 Smartforms, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2018-05-24.
How severe is CVE-2018-9920?: Medium severity. CVSS v3 base score is 6.5 out of 10.