# CVE-2026-90447

## Summary

- **CVE ID:** CVE-2026-90447
- **Severity:** HIGH
- **CVSS Score:** 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)
- **CWE:** CWE-290
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

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 Products

- CISA — Malcolm (0)
- CISA — Malcolm (v26.06.0)

## References

- [CNA](https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.1

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._