---
id: CVE-2026-44745
title: >-
  SAP Approuter does not properly validate incoming request headers during the
  OAuth2 login flow under certain configurations
summary: >-
  SAP Approuter does not properly validate incoming request headers during the
  OAuth2 login flow under certain configurations. This allows an unauthenticated
  remote attacker to craft a malicious link which, when clicked by a victim,
  could …
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-601
vendor: sap
product: approuter
affected:
  - approuter < 21.2.0
patched:
  - approuter 21.2.0
published: '2026-07-14'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:20:34.980'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44745'
references:
  - url: 'https://me.sap.com/notes/3741519'
    label: cna@sap.com
  - url: 'https://url.sap/sapsecuritypatchday'
    label: cna@sap.com
tags:
  - nvd
epss: 0.00466
epssPercentile: 0.39542
ingestedAt: '2026-09-08T21:11:12.257Z'
---

## Overview

SAP Approuter does not properly validate incoming request headers during the OAuth2 login flow under certain configurations. This allows an unauthenticated remote attacker to craft a malicious link which, when clicked by a victim, could lead to unauthorized access. Successful exploitation results in a high impact to the confidentiality and integrity with no impact on the availability of the application.

## Affected

- `approuter < 21.2.0`

## Remediation

Upgrade past the affected range:

- `approuter 21.2.0`