Dynamics 365
CVE-2020-1591
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, user interaction required. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAI
A cross site scripting vulnerability exists when Microsoft Dynamics 365 (on-premises) does not properly sanitize a specially crafted web request to an affected Dynamics server. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. A cross site scripting vulnerability exists when Microsoft Dynamics 365 (on-premises) does not properly sanitize a specially crafted web request to an affected Dynamics server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected Dynamics server. The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current authenticated user. These attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions within Dynamics Server on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user. The security update addresses the vulnerability by helping to ensure that Dynamics Server properly sanitizes web requests. Affected products include: Microsoft Dynamics 365.
Know when Dynamics 365 gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
A cross site scripting vulnerability exists when Microsoft Dynamics 365 (on-premises) does not properly sanitize a specially crafted web request to an affected Dynamics server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected Dynamics server. The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current authenticated user. These attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions within Dynamics Server on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user. The security update addresses the vulnerability by helping to ensure that Dynamics Server properly sanitizes web requests.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
More in Dynamics 365
View allPrivilege escalation in Microsoft Dynamics 365 Customer Insights allows an authenticated low-privilege user to cross an
Remote code execution in Microsoft Dynamics 365 on-premises version 9.1 (prior to build 9.1.0046.0006) is achievable by
Weak authentication in Microsoft Dynamics 365 allows an unauthenticated attacker to elevate privileges over a network. R
Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerabili
Remote code execution in Microsoft Dynamics 365 on-premises is achievable by any authenticated low-privileged user via a
Remote code execution in Microsoft Dynamics 365 Customer Engagement V9.1 (versions below 9.1.0048.0004) is achievable by
Privilege escalation in Microsoft Dynamics 365 (on-premises) allows a remote authenticated attacker with low-level acces
Microsoft Dynamics CRM (on-premises) Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerabi
Microsoft Dynamics CRM (on-premises) Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerabi
Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerabili
Microsoft Dynamics 365 for Finance and Operations (on-premises) Remote Code Execution Vulnerability. Rated high severity
Microsoft Dynamics 365 for Finance and Operations (on-premises) Remote Code Execution Vulnerability. Rated high severity
GitHub PoC
Exploit-DB