---
id: CVE-2026-66760
title: >-
  SAP Approuter does not correctly validate client certificates in certain
  callback flows
summary: >-
  SAP Approuter does not correctly validate client certificates in certain
  callback flows. An attacker with low privileges, holding a certificate from
  the same trusted authority with matching subject values, could bypass the
  identity check…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L'
cwe:
  - CWE-295
vendor: sap
product: approuter
affected:
  - approuter < 23.0.0
patched:
  - approuter 23.0.0
published: '2026-08-11'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:22:13.790'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66760'
references:
  - url: 'https://me.sap.com/notes/3786038'
    label: cna@sap.com
  - url: 'https://url.sap/sapsecuritypatchday'
    label: cna@sap.com
tags:
  - nvd
epss: 0.00181
epssPercentile: 0.06774
ingestedAt: '2026-09-08T21:11:12.274Z'
---

## Overview

SAP Approuter does not correctly validate client certificates in certain callback flows. An attacker with low privileges, holding a certificate from the same trusted authority with matching subject values, could bypass the identity check. This complexity makes the attack difficult to execute. Successful exploitation could allow impersonation of a trusted internal component, resulting in a high impact on integrity and a low impact on confidentiality and availability.

## Affected

- `approuter < 23.0.0`

## Remediation

Upgrade past the affected range:

- `approuter 23.0.0`