CVE-2026-25656 Privilege escalation in SINEC NMS

What is CVE-2026-25656?

CVE-2026-25656 is a high-severity vulnerability in Siemens SINEC NMS, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3), User Management Component (UMC) (All versions < V2.15.2.1). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108)

Weakness: CWE-427

Which versions are affected by CVE-2026-25656?

It affects 2 products.

Products include Siemens Sinec Nms, Siemens User Management Component.

How do I fix CVE-2026-25656?

No fix has been published for CVE-2026-25656 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-25656 being exploited?

There is no known exploitation of CVE-2026-25656 in the wild and no public exploit code.

Other vulnerabilities in Siemens SINEC NMS

• CVE-2024-41940 Command injection in SINEC NMS Critical 9.4
• CVE-2025-40736 Missing authorization in SINEC NMS Critical 9.3
• CVE-2021-33724 Path traversal in SINEC NMS Critical 9.1
• CVE-2021-33725 Path traversal in SINEC NMS Critical 9.1
• CVE-2024-23810 SQL injection in SINEC NMS High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-43rq-xvwq-hp7q.