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CVE Record

CVE-2026-58643: Windows Admin Center Spoofing Vulnerability

Improper neutralization of input during web page generation ('cross-site scripting') in Windows Admin Center allows an unauthorized attacker to perform spoofing over a network.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a medium-severity spoofing issue in Microsoft Windows Admin Center 1809.0 caused by cross-site scripting. An unauthenticated network attacker could influence what a user sees, but user interaction is required. The cited sources do not show active exploitation.

Executive priority

Handle through the normal vulnerability management cycle, with higher priority for exposed administrative consoles. The issue can affect trust in an admin web interface, but sources indicate medium severity and no confirmed active exploitation.

Technical view

CVE-2026-58643 is CWE-79 in Windows Admin Center 1809.0. CVSS 3.1 is 6.1: network exploitable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact. Microsoft lists remediation via its advisory.

Likely exposure

Exposure appears limited to environments running Windows Admin Center 1809.0, especially where the web interface is reachable by administrators or users over a network. The bundle does not list other affected versions.

Exploitation context

The CVE is not listed as KEV, and the CVSS exploit maturity is unproven. Treat exploitation as plausible but not confirmed by the provided sources. User interaction is required, reducing immediate automation risk.

Researcher notes

The key constraints are UI:R and low C/I impact. Scope changes because browser-executed content can affect a security context beyond the vulnerable component. The provided bundle lacks exploit details, proof-of-concept status, and detailed patch mechanics.

Mitigation direction

  • Apply Microsoft guidance or patch from the MSRC advisory.
  • Inventory Windows Admin Center deployments and identify version 1809.0.
  • Restrict Windows Admin Center access to trusted administrative networks.
  • Prioritize remediation where the console is broadly reachable.

Validation and detection

  • Confirm whether Windows Admin Center 1809.0 is deployed.
  • Verify the MSRC-recommended update or remediation is applied.
  • Check whether the console is exposed beyond trusted administrators.
  • Review relevant web access logs for unusual spoofing-related activity.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-58643 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
1ADP providers
2Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C2.82.7microsoft

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2026-58643Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MicrosoftWindows Admin Center1809.0Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.