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CVE-2020-1049

16
FAUCET Score

CVE-2020-1049 describes a cross-site scripting (XSS) vulnerability in Microsoft Dynamics 365 (on-premises) that arises from insufficient sanitization of specially crafted web requests. This flaw could allow an attacker to inject malicious scripts into affected Dynamics servers. Rated with a CVSS score of 5.4 (Medium), the vulnerability requires user interaction (UI:R) and low privileges (PR:L) for exploitation over a network (AV:N). Successful exploitation could lead to limited confidentiality and integrity impacts (C:L/I:L), but not availability (A:N). There is no evidence of active exploitation, and no public exploit code is available via Metasploit, Nuclei, or ExploitDB. While it received limited community discussion and media coverage at the time of its disclosure, its EPSS score indicates a very low probability of exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
9.0CPE matchmatch criteria
cpe:2.3:a:microsoft:dynamics_365_server:9.0:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.47%
Probability of exploitation in next 30 days
EPSS Percentile
71.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0147 is in the 96th percentile among its peer group of 15,224 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Dynamics 365 Server, version 9.0 (on-premises)
View patch

Vendor Advisories (1)

microsoft2020-Apr/CVE-2020-1049Important

Microsoft Dynamics 365 (On-Premise) Cross Site Scripting Vulnerability

Apr 14, 2020

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2020-1049
PatchVendor Advisory