CVE-2026-23651

Local privilege escalation via permissive regular expression

Published Mar 5, 2026 · Updated Mar 5, 2026

Permissive regular expression in Microsoft ACI Confidential Containers allows local users with high privileges to elevate privileges. Azure Compute Gallery uses an overly broad regular expression that accepts unintended values, but Microsoft has not disclosed the pattern, input, or affected operation. Exploitation requires local access and high existing privileges; success grants additional privileges to read or alter protected data or interrupt the service.

CVSS severity6.7
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Permissive regular expression in Microsoft ACI Confidential Containers allows local users with high privileges to elevate privileges. Azure Compute Gallery uses an overly broad regular expression that accepts unintended values, but Microsoft has not disclosed the pattern, input, or affected operation. Exploitation requires local access and high existing privileges; success grants additional privileges to read or alter protected data or interrupt the service.

The record

CVE
CVE-2026-23651
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
Microsoft
Product
Confidential containers on Azure Container Instances
Classifications
CWE-625, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Microsoft · Confidential containers on Azure Container Instancesversion=-

Published CVSS scores

6.7Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-625Permissive Regular Expression
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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