CVE-2026-50652: Deserialization of untrusted data in Azure Active Directory allows an unauthorized attacker to deny service ov

This month

HIGH 7.5REMOTEWATCHLISTDOWNGRADEMITIGATE

CVE-2026-50652 is a high-severity flaw (CVSS 7.5) affecting .net framework, azure active directory. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data in Azure Active Directory allows an unauthorized attacker to deny service over a network.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-07-14
Last modified	2026-07-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 17:17 UTCPublished CVE record published
2026-07-24 15:41 UTCUpdated Record last modified

microsoft .net framework DOWNGRADE

Affected: 3.5 · 4.8.1 · 4.6.2 · 4.7 · 4.7.1 · 4.7.2 · 4.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5

1. Check installed version

apt-cache policy .net-framework || rpm -q .net-framework || .net-framework --version

2. No fixed release: DOWNGRADE to a release before 3.5 (Debian / Ubuntu)

apt-cache madison .net-framework sudo apt install .net-framework=<VERSION_BEFORE_3.5> sudo apt-mark hold .net-framework

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net-framework sudo dnf downgrade .net-framework-<VERSION_BEFORE_3.5> sudo dnf versionlock add .net-framework

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

microsoft azure active directory MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy azure-active-directory || rpm -q azure-active-directory || azure-active-directory --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · gcl · FIXED · 2.7.1-12.fc46 · FEDORA-2026-ff383a759b · source

sudo dnf upgrade --advisory=FEDORA-2026-ff383a759b

Fedora ELN · mozjs140 · FIXED · 140.13.0-5.eln159 · FEDORA-2026-f7ed0026e0 · source

sudo dnf upgrade --advisory=FEDORA-2026-f7ed0026e0

Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems · KB5101014 · FIXED · 2.0.50727.9182 & 3.0.30729.9168 · KB5101014 · source

Install KB5101014 via Windows Update, then verify: Get-HotFix -Id KB5101014

Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems · KB5101014 · FIXED · 2.0.50727.9182 & 3.0.30729.9168 · KB5101014 · source

Install KB5101014 via Windows Update, then verify: Get-HotFix -Id KB5101014

Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems · KB5101002 · FIXED · 4.8.9340.0 · KB5101002 · source

Install KB5101002 via Windows Update, then verify: Get-HotFix -Id KB5101002

Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems · KB5101002 · FIXED · 4.8.9340.0 · KB5101002 · source

Install KB5101002 via Windows Update, then verify: Get-HotFix -Id KB5101002

Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems · KB5101007 · FIXED · 4.8.4803.0 · KB5101007 · source

Install KB5101007 via Windows Update, then verify: Get-HotFix -Id KB5101007

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-50652?

.net framework: downgrade or apply the listed mitigation; azure active directory: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-50652 being exploited?

CVE-2026-50652 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-50652 affect?

CVE-2026-50652 affects .net framework, azure active directory. Severity is high (CVSS 7.5). Deserialization of untrusted data in Azure Active Directory allows an unauthorized attacker to deny service over a network.

How urgent is CVE-2026-50652?

Priority 56/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Azure vulnerabilities · Active Directory vulnerabilities · .NET vulnerabilities

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References

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