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Authentication Bypass by Spoofing in Azure HorizonDB

IdentifiersCVE-2026-48567CWE-290· Authentication Bypass by Spoofing

CVE-2026-48567 is an authentication bypass by spoofing vulnerability affecting Azure HorizonDB. According to the provided Microsoft advisory content, the flaw allows an unauthorized attacker to bypass authentication over the network and elevate privileges. The issue is classified under CWE-290 and is described as network-exploitable with low attack complexity, no required privileges, and no user interaction. The provided material does not identify the specific vulnerable component, protocol flow, or function within Azure HorizonDB.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated remote attacker to bypass authentication controls by spoofing and gain elevated privileges in Azure HorizonDB over the network. Based on the provided CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H), the primary impacts are high integrity and high availability impact, with changed scope and no stated confidentiality impact in the advisory data.

Mitigation

If you can’t patch tonight, do this now.

No customer mitigation is required. Microsoft states the issue has already been fully mitigated within the cloud service and there is no action for users of Azure HorizonDB to take.

Remediation

Patch, then assume compromise.

No customer remediation is required. Microsoft states the vulnerability has already been fully mitigated by Microsoft as part of the Azure-hosted service, and the CVE was published for transparency.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Microsoft CorporationAzure Horizondbapplication
Microsoft CorporationHorizondbapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-48567
NVD
nvd.nist.gov/vuln/detail/CVE-2026-48567
MITRE CWE · CWE-290
Authentication Bypass by Spoofing
Vendor Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48567