CVE Tools
Track your stack

CVE-2026-66822

.NET Information Disclosure Vulnerability

No known exploitation. No EPSS score yet. Fixed versions are out.

CVSS 3.15.9MediumEPSS percentile—No score yetCISA 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, < 10.0.13Upgrade to: 10.0.13Stated by: CVE record
  • Microsoft .NET 11.0Affected: ≥ 11.0.0, < 11.0.0-rc.2Upgrade to: 11.0.0-rc.2Stated by: CVE record
  • Microsoft .NET 8.0Affected: ≥ 8.0.0, < 8.0.32Upgrade to: 8.0.32Stated by: CVE record
  • Microsoft .NET 9.0Affected: ≥ 9.0.0, < 9.0.21Upgrade to: 9.0.21Stated by: CVE record
  • Microsoft Visual Studio 2022 version 17.14Affected: ≥ 17.14.0, < 17.14.42Upgrade to: 17.14.42Stated by: CVE record

Versions as the sources state them. 1 more product has version data. Full version matrix after sign-in

What it is

From the CVE record

Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information 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.

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

No EPSS score yet. New CVEs are usually scored within a few days.

Lifecycle

4 events over 0 days, from the signal feeds we watch.

  1. Publishedweakness classified, record updated, record updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 5.9 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

In the news

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for .NET 10.0, not every advisory.