CVE-2026-24303
Published: 23 April 2026
Summary
CVE-2026-24303 is a critical-severity Improper Access Control (CWE-284) vulnerability in Microsoft Partner Center. Its CVSS base score is 9.6 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 17.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-6 (Least Privilege).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
AC-3 enforces approved authorizations for access to resources, directly mitigating the improper access control vulnerability enabling privilege escalation in Microsoft Partner Center.
AC-6 applies the principle of least privilege to restrict low-privileged attackers from escalating to higher privileges over the network.
AC-2 ensures proper account management and privilege assignment, reducing conditions that allow authorized low-privilege users to exploit access control flaws for escalation.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct mapping to exploitation of improper access control for remote privilege escalation from low-privileged authorized account.
NVD Description
Improper access control in Microsoft Partner Center allows an authorized attacker to elevate privileges over a network.
Deeper analysisAI
CVE-2026-24303, published on 2026-04-23, is an improper access control vulnerability (CWE-284) affecting Microsoft Partner Center. The flaw enables an authorized attacker to elevate privileges over a network and carries a CVSS v3.1 base score of 9.6 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N), indicating critical severity due to its network accessibility, low complexity, and potential for high confidentiality and integrity impacts with a changed scope.
An attacker requires low privileges (PR:L) to exploit the vulnerability remotely over the network (AV:N) without user interaction (UI:N) or high complexity (AC:L). Successful exploitation allows privilege escalation, expanding the attacker's control across scopes (S:C) to achieve high levels of unauthorized data access (C:H) and modification (I:H), with no direct availability impact (A:N).
Microsoft's advisory provides guidance on mitigation; security practitioners should consult the official update at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24303 for patches and remediation steps.
Details
- CWE(s)