CVE-2026-122987: Microsoft High Performance Computing (HPC) Pack Elevation of Privilege Vulnerability
CVE-2026-122987 is an elevation of privilege vulnerability in Microsoft High Performance Computing (HPC) Pack, rated Important by Microsoft, with a CVSS 3.1 base score of 5.9 (Medium). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday. It affects 2 products in 1 product family (Azure).
Key facts
- CVE ID
- CVE-2026-122987
- Severity
- Medium CVSS 5.9
- Microsoft severity
- Important
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- Weakness
- CWE-306
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Azure
CVSS score and vector
Microsoft scores CVE-2026-122987 at 5.9 (temporal 5.2) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | None |
| Availability impact | None |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Missing authentication for critical function in Microsoft High Performance Computing (HPC) Pack allows an unauthorized attacker to elevate privileges over a network.
Frequently asked questions (Microsoft)
According to the CVSS metric, the attack complexity is high (AC:H). What does this mean for this vulnerability?
An attacker would need specific conditions to be in place (i.e. particular protocol settings, or configurations, etc.) before an attack could succeed, which reduces the likelihood of widespread or opportunistic exploitation.
What type of information could be disclosed by this vulnerability?
Exploiting this vulnerability could allow the disclosure of credentials.
Affected products (2)
Azure
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft HPC Pack 2019 | Release Notes | Security Update | 6.3.8364 | Yes |
| Microsoft HPC Pack 2016 | Release Notes | Security Update | Yes |
NIST NVD data
- NVD status
- Awaiting Analysis
- NVD CVSS
- 5.9 (MEDIUM)
- NVD weakness
- CWE-306
- Published to NVD
- NVD last modified
References
Acknowledgments
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |