SB2026042480 - Multiple vulnerabilities in Siemens SINEC NMS

Description

This security bulletin contains information about 2 vulnerabilities.

1) Authorization bypass through user-controlled key (CVE-ID: CVE-2026-25654)

CWE-ID: CWE-639 - Authorization Bypass Through User-Controlled Key

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the affected application does not properly validate user authorization when processing password reset requests. A remote user can bypass authorization checks and reset the password of any arbitrary user account.

2) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-24032)

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user identity in the UMC component within the httpd authentication handler. A remote attacker can bypass authentication and gain unauthorized access to the application.

Remediation

Install update from vendor's website.

References

• https://www.zerodayinitiative.com/advisories/ZDI-26-297/
• https://cert-portal.siemens.com/productcert/html/ssa-605717.html
• https://www.zerodayinitiative.com/advisories/ZDI-26-298/
• https://cert-portal.siemens.com/productcert/html/ssa-801704.html