What is CVE-2020-8160?

CVE-2020-8160 is a medium-severity vulnerability in Mendix Mendixsso, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-06.

How severe is CVE-2020-8160?

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

XSS in Mendix Mendixsso

CVE-2020-8160

MendixSSO <= 2.1.1 contains endpoints that make use of the openid handler, which is suffering from a Cross-Site Scripting vulnerability via the URL path. This is caused by the reflection of user-supplied data without appropriate HTML escaping or output encoding. As a result, a JavaScript payload may be injected into the above endpoint causing it to be executed within the context of the victim's browser.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-06 · last modified 2026-06-17.

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 (51.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% 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

Mendix Mendixsso
Mendixsso — versions 2.1.1 and lower

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

hackerone.com/reports/838178 (Third Party Advisory)
marketplace.mendix.com/link/component/111349 (Product, Vendor Advisory)

Frequently asked questions

What is CVE-2020-8160?: CVE-2020-8160 is a medium-severity vulnerability in Mendix Mendixsso, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-06.
How severe is CVE-2020-8160?: Medium severity. CVSS v3 base score is 6.1 out of 10.