CVE-2026-90447
Authentication Bypass by Spoofing in Malcolm
CVSS Score
6.5
EPSS Score
0.5%
EPSS Percentile
38th
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.
| CWE | CWE-290 |
| Vendor | cisa |
| Product | malcolm |
| Published | Sep 11, 2026 |
| Last Updated | Oct 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
CISA / Malcolm
0 < v26.06.0