CVE-2026-90447

published 2026-09-11

CVE-2026-90447: A routing rule selects between two different authentication mechanisms for the same downstream service based on the value of a client-supplied request header…

Priority P3 44 high 7.1 CVSS 4.0

AV N AC L AT N PR L UI N VC N VI H VA N SC N SI N SA N E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

A routing rule selects between two different authentication mechanisms for the same downstream service based on the value of a client-supplied request header, rather than on any property the client cannot control. An authenticated user in possession of a shared service credential can set this header to route around the primary role-based authorization check and reach the alternate path's fixed, elevated role instead. This allows a low-privileged authenticated attacker who knows the shared credential to perform actions reserved for a higher-privileged role.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
cisa	malcolm	< v26.06.0	v26.06.0

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CWE-290