CVE-2026-70340: Azure CycleCloud Elevation of Privilege Vulnerability
CVE-2026-70340 is an elevation of privilege vulnerability in Azure CycleCloud, rated Important by Microsoft, with a CVSS 3.1 base score of 8.1 (High). An attacker can exploit it remotely over the network, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. The EPSS model estimates a 0.80% probability of exploitation activity in the next 30 days, higher than 57% of all scored vulnerabilities. Microsoft released the fix on 11 August 2026 in the August 2026 Patch Tuesday. It affects 1 product in 1 product family (Azure).
Key facts
- CVE ID
- CVE-2026-70340
- Severity
- High CVSS 8.1
- Microsoft severity
- Important
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- Weakness
- CWE-862
- EPSS
- 0.80% (percentile 57%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- August 2026 Patch Tuesday
- Product families
- Azure
CVSS score and vector
Microsoft scores CVE-2026-70340 at 8.1 (temporal 7.1) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | High |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Missing authorization in Azure CycleCloud allows an authorized attacker to elevate privileges over a network.
Frequently asked questions (Microsoft)
How could an attacker exploit this vulnerability?
An authenticated user who has the Cluster Creator role could exploit this vulnerability by using a cluster creation operation in a way that bypasses an authorization check. By doing so, the attacker could overwrite another user’s cluster, including a cluster owned by an administrator, and take ownership of it.
What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited this vulnerability could gain full control of the affected cluster that was overwritten and taken over. This could allow the attacker to run unauthorized code, remove or alter credentials associated with the cluster, and perform actions with the same level of access available within that cluster.
Affected products (1)
Azure
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Azure CycleCloud 8.9.1 | Release Notes | Security Update | 8.9.1 | No |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 8.1 (HIGH)
- NVD weakness
- CWE-862
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| azure cyclecloud | before 8.9.1 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70340 (Vendor Advisory)
Acknowledgments
- XBREACH.AI TEAM with https://xbreach.ai/
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |