CVE-2026-25654
Authorization Bypass in SINEC NMS Allows Password Reset Abuse
Publication date: 2026-04-14
Last updated on: 2026-04-14
Assigner: Siemens AG
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| siemens | sinec_nms | to 4.0_sp3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-639 | The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. |
Attack-Flow Graph
AI Powered Q&A
What immediate steps should I take to mitigate this vulnerability?
To mitigate the vulnerability in SINEC NMS versions prior to V4.0 SP3, Siemens recommends updating all affected versions to V4.0 SP3 or later.
Additional mitigation steps include limiting network access to trusted users and systems only.
It is also advised to follow general security recommendations such as protecting network access with appropriate mechanisms and configuring the environment according to Siemens' operational guidelines for Industrial Security.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The vulnerability allows an authenticated remote attacker to bypass authorization checks and reset the password of any arbitrary user account, which could lead to unauthorized access to sensitive information.
Such unauthorized access risks violating common standards and regulations like GDPR and HIPAA, which require strict controls on user authentication and access to personal or sensitive data.
Therefore, if exploited, this vulnerability could compromise compliance by undermining the confidentiality and integrity of user accounts and associated data.
Siemens recommends updating to a fixed version and applying network access restrictions and security best practices to mitigate these risks and help maintain compliance.
How can this vulnerability impact me? :
An attacker who exploits this vulnerability can reset passwords of any user account without proper authorization.
This could lead to unauthorized access to sensitive systems and data managed by SINEC NMS.
Such unauthorized access can compromise confidentiality, integrity, and availability of network management operations.
Can you explain this vulnerability to me?
This vulnerability exists in SINEC NMS versions prior to V4.0 SP3 where the system does not properly validate user authorization when processing password reset requests.
As a result, an authenticated remote attacker can bypass authorization checks and reset the password of any arbitrary user account.
This issue is classified as an Authorization Bypass vulnerability (CWE-639) and has a high severity score.