Cyber Resilience

CVE-2026-23651

Microsoft Aci Confidential Containers

Published
05 March 2026
Modified
16 March 2026
Patch / advisory
View advisory
CVSS Score v3.1 6.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0059 45th percentile
Risk Priority 50 floored blend · peak EPSS

Summary

CVE-2026-23651 is a medium-severity Permissive Regular Expression (CWE-625) vulnerability in Microsoft Aci Confidential Containers. Its CVSS base score is 6.7 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 45th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Permissive regular expression in Azure Compute Gallery allows an authorized attacker to elevate privileges locally.

CWE(s)
CWE-625NVD-CWE-Other

Related Threats

MITRE ATT&CK Enterprise Techniques

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

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Affected Assets

microsoft
aci confidential containers
all versions

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation partial match

SI-10 requires validity checks on inputs, directly stopping permissive regex patterns from being used for validation.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require robust input-validation regex and testing that would prevent permissive patterns.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect permissive regex through fuzzing or negative test cases.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle requires validation of input mechanisms, including regex, reducing permissive patterns.

A.8.26 Application security requirements partial match
prevents

Application security requirements mandate strict input validation rules that would catch overly permissive regex.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prohibit permissive regex and enforce strict pattern validation.

References