CVE-2026-25654
Received Received - Intake
Authorization Bypass in SINEC NMS Allows Password Reset Abuse

Publication date: 2026-04-14

Last updated on: 2026-04-14

Assigner: Siemens AG

Description
A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3). Affected products do not properly validate user authorization when processing password reset requests. This could allow an authenticated remote attacker to bypass authorization checks, leading to the ability to reset the password of any arbitrary user account.
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Meta Information
Published
2026-04-14
Last Modified
2026-04-14
Generated
2026-06-16
AI Q&A
2026-04-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-25654
EUVD
EUVD-2026-22236
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
siemens sinec_nms to 4.0_sp3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Impact Analysis

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.

Executive Summary

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.

Mitigation Strategies

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.

Compliance Impact

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.

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