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CVE Record

CVE-2026-32178: .NET Spoofing Vulnerability

Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

.NET contains a spoofing flaw that can be reached over the network without authentication or user interaction. Microsoft rates it high severity, with potential confidentiality impact. Treat it as a priority for .NET services handling sensitive data, especially externally reachable applications.

Executive priority

Handle in the next high-severity remediation window, with accelerated treatment for externally reachable .NET services or systems handling confidential information. There is no provided evidence of active exploitation, but network reachability raises business urgency.

Technical view

CVE-2026-32178 is described as improper neutralization of special elements in .NET, mapped to CWE-138. The provided affected list includes .NET 8.0, 9.0, 10.0, and Visual Studio 2022 17.12 and 17.14. CVSS 3.1 is 7.5: network, low complexity, no privileges, no user interaction, confidentiality high.

Likely exposure

Exposure is most likely where affected .NET runtimes, SDKs, or Visual Studio components are installed in production, build, or developer environments. Red Hat advisories indicate downstream packaging may also require review.

Exploitation context

The bundle does not show CISA KEV listing or any cited evidence of active exploitation. CVSS marks exploit code maturity as unproven. The network attack vector and no-auth requirement still make timely remediation important.

Researcher notes

Public details in the bundle are sparse: no root-cause detail, exploit narrative, or fixed version numbers are provided. Avoid assuming exploitability beyond the CVSS vector and vendor description. Use MSRC and Red Hat advisories as authoritative tracking sources.

Mitigation direction

  • Apply Microsoft guidance and security updates for affected .NET and Visual Studio versions.
  • Review Red Hat errata if using Red Hat-packaged .NET components.
  • Prioritize internet-facing .NET services and systems processing sensitive data.
  • Rebuild and redeploy applications after runtime or base-image updates where applicable.
  • Monitor vendor advisories for clarified affected versions and fixed release details.

Validation and detection

  • Inventory installed .NET runtimes, SDKs, Visual Studio versions, containers, and build images.
  • Compare discovered versions against Microsoft MSRC and Red Hat advisory status.
  • Confirm patched runtime versions are used by running services, not only installed side by side.
  • Check vulnerability scanner results against SBOMs and container base images.
  • Verify deployment pipelines rebuild images after patched dependencies are available.
Prepared
Confidence
medium
Sources
8

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 · low confidence lookup

CWE-138: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2026-32178 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
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

2CVSS vectors
5Timeline events
2ADP providers
22Source links

SSVC decision data

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

CVSS vector scores

2 official scores

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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C3.93.6microsoft
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-32178Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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. ADP timelineredhat-SADP

    Reported to Red Hat.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Made public.

  5. CVE updatedCVE Program

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

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPdotnet: Dotnet: SMTP Command Injection and Header Injection via MailAddress parsing flaw
other:Red Hat severity ratingcvssV3_1
  • 2026-04-13T08:04:44.681Z: Reported to Red Hat.
  • 2026-04-14T18:41:05.485Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Microsoft.NET 10.010.0.0Listed
Microsoft.NET 8.08.0Listed
Microsoft.NET 8.08.0.0Listed
Microsoft.NET 9.09.0.0Listed
MicrosoftMicrosoft Visual Studio 2022 version 17.1217.12.0Listed
MicrosoftMicrosoft Visual Studio 2022 version 17.1417.14.0Listed
Weakness

CWE details

CWE-138

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

CWE-138 · source CWE mapping

Improper Neutralization of Special Elements

Improper Neutralization of Special Elements represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs