What is CVE-2020-21088?

CVE-2020-21088 is a medium-severity vulnerability in X2engine X2crm, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-04-14.

How severe is CVE-2020-21088?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in X2engine X2crm

CVE-2020-21088

Cross Site Scripting (XSS) in X2engine X2CRM v7.1 and older allows remote attackers to obtain sensitive information by injecting arbitrary web script or HTML via the "First Name" and "Last Name" fields in "/index.php/contacts/create page"

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.5% 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

X2engine X2crm

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/X2Engine/X2CRM/issues/161 (Exploit, Third Party Advisory)
github.com/X2Engine/X2CRM/issues/183 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-21088?: CVE-2020-21088 is a medium-severity vulnerability in X2engine X2crm, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-04-14.
How severe is CVE-2020-21088?: Medium severity. CVSS v3 base score is 4.8 out of 10.