Siemens SINEC NMS Authentication Bypass Vulnerability

April 23rd, 2026
ZDI-26-298 ZDI-CAN-27564

CVE ID

CVE-2026-24032

CVSS Score

7.3 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected Vendors

Siemens

Affected Products

SINEC NMS

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on affected installations of Siemens SINEC NMS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the httpd authentication handler. The issue results from incorrect implementation of an authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

Siemens has issued an update to correct this vulnerability. More details can be found at:
https://cert-portal.siemens.com/productcert/html/ssa-801704.html

Disclosure Timeline

  • 2025-12-24 - Vulnerability reported to vendor
  • 2026-04-23 - Coordinated public release of advisory
  • 2026-04-23 - Advisory Updated

Credit

Anonymous

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