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CVE-2020-1055

Microsoft Active Directory Federation Services Cross-Site Scripting Vulnerability

MEDIUM
5.5
CVSS Score
Published: May 21, 2020 at 10:52 PM UTC
Updated: August 19, 2026 at 05:35 PM UTC
8 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows 10 1809

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Severity
MEDIUM5.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

A cross-site-scripting (XSS) vulnerability exists when Active Directory Federation Services (ADFS) does not properly sanitize user inputs, aka 'Microsoft Active Directory Federation Services Cross-Site Scripting Vulnerability'.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10· Microsoft
95%
10.0.0 ≤ v < publication180919031909
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1809· Microsoft
95%
10.0.0 ≤ v < publication10.0.17763.0 ≤ v < publication10.0.010.0.17763.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1909· Microsoft
95%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows Server 1903· Microsoft
95%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows Server 1909· Microsoft
95%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows Server 2016· Microsoft
95%
19031909
Windows Server 2019· Microsoft
95%
10.0.17763.0 ≤ v < publication10.0.17763.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1903· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

PatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1055
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1055

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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