What is CVE-2020-17147?

CVE-2020-17147 is a high-severity vulnerability in Microsoft Dynamics 365, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2020-12-10.

How severe is CVE-2020-17147?

High severity. CVSS v3 base score is 8.7 out of 10.

XSS in Microsoft Dynamics 365

CVE-2020-17147

Dynamics CRM Webclient Cross-site Scripting Vulnerability

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-12-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.3th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Microsoft Dynamics 365 — versions 8.2, 9.0
Microsoft Dynamics 365 (On-Premises) Version 8.2 — versions 8.0
Microsoft Dynamics 365 (On-Premises) Version 9.0 — versions 9.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17147 (vendor-advisory, patch)
af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-17147?: CVE-2020-17147 is a high-severity vulnerability in Microsoft Dynamics 365, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2020-12-10.
How severe is CVE-2020-17147?: High severity. CVSS v3 base score is 8.7 out of 10.