What is CVE-2025-55244?

CVE-2025-55244 is a critical-severity vulnerability in Microsoft Azure Ai Bot Service, classified under Improper Access Control. CVSS score: 9.0/10. Published 2025-09-04.

How severe is CVE-2025-55244?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Is CVE-2025-55244 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Microsoft Azure Ai Bot Service

CVE-2025-55244

Azure Bot Service Elevation of Privilege Vulnerability

Published 2025-09-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55244 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-55244?: CVE-2025-55244 is a critical-severity vulnerability in Microsoft Azure Ai Bot Service, classified under Improper Access Control. CVSS score: 9.0/10. Published 2025-09-04.
How severe is CVE-2025-55244?: Critical severity. CVSS v3 base score is 9.0 out of 10.
Is CVE-2025-55244 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.