How severe is CVE-2020-17147?

CVE-2020-17147 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2020-17147 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17147?

CVE-2020-17147 primarily affects Microsoft Dynamics 365. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-17147?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-17147 published?

CVE-2020-17147 was published on 2020-12-10 and last updated on 2026-06-17.

CVE-2020-17147

CVE-2020-17147 is a high-severity vulnerability in Microsoft Dynamics 365 with a CVSS 3.x base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.7)
CVSS v2: 3.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microsoft Dynamics 365
Published: 2020-12-10
Last modified: 2026-06-17

Description

Dynamics CRM Webclient Cross-site Scripting Vulnerability

Frequently asked questions

What is CVE-2020-17147?: Dynamics CRM Webclient Cross-site Scripting Vulnerability
How severe is CVE-2020-17147?: CVE-2020-17147 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2020-17147 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17147?: CVE-2020-17147 primarily affects Microsoft Dynamics 365. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-17147?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-17147 published?: CVE-2020-17147 was published on 2020-12-10 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:microsoft:dynamics_365:8.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:dynamics_365:9.0:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Dynamics 365

CVE-2026-47647 — Critical (CVSS 9.9): Improper access control in Microsoft Dynamics 365 allows an authorized attacker to elevate privileges over a network.
CVE-2026-42898 — Critical (CVSS 9.9): Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an authorized…
CVE-2026-32210 — Critical (CVSS 9.3): Server-side request forgery (ssrf) in Microsoft Dynamics 365 (Online) allows an unauthorized attacker to perform…
CVE-2026-42833 — Critical (CVSS 9.1): Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an authorized…
CVE-2024-38182 — Critical (CVSS 9.0): Weak authentication in Microsoft Dynamics 365 allows an unauthenticated attacker to elevate privileges over a network.
CVE-2026-40371 — High (CVSS 8.8): Improper handling of insufficient permissions or privileges in Microsoft Dynamics 365 (on-premises) allows an…

All CVEs affecting Microsoft Dynamics 365 →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →