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CVE-2026-50659

.NET Spoofing Vulnerability

No known exploitation. EPSS puts it in the 54th percentile. Fixed versions are out.

CVSS 3.16.5MediumEPSS percentile54th0.7% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products5 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Microsoft .NET 10.0Affected: ≥ 10.0.0, < 10.0.10Upgrade to: 10.0.10Stated by: CVE record
  • Microsoft .NET 8.0Affected: ≥ 8.0.0, < 8.0.29Upgrade to: 8.0.29Stated by: CVE record
  • Microsoft .NET 9.0Affected: ≥ 9.0.0, < 9.0.18Upgrade to: 9.0.18Stated by: CVE record
  • Microsoft .NET Framework 3.5Affected: ≥ 3.5.0, < 2.0.50727.8983 & 3.0.30729.8978Upgrade to: 2.0.50727.8983 & 3.0.30729.8978Stated by: CVE record
  • Microsoft .NET Framework 3.5 AND 4.7.2Affected: ≥ 4.7.0, < 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0Upgrade to: 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0Stated by: CVE record

Versions as the sources state them. 11 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS54th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.7% chance of exploitation activity in the next 30 days, which ranks it in the 54th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

12 events over 92 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. Patch availablerecord updated
  3. Record updatedrecord updated
  4. Record updated
  5. OpenVAS check added
  6. Record updated

Affected products

And 9 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 6.5 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality NoneNo confidentiality impact
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

In the news

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We'll flag the next CVE, public exploit or patch for .net Framework, not every advisory.