---
id: CVE-2026-66776
title: >-
  SAP Approuter does not consistently enforce integrity verification on certain
  session-related request headers under specific conditions
summary: >-
  SAP Approuter does not consistently enforce integrity verification on certain
  session-related request headers under specific conditions. An attacker with
  low privileges could send a specially crafted request that bypasses the
  integrity c…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-347
vendor: sap
product: approuter
affected:
  - approuter < 23.0.0
patched:
  - approuter 23.0.0
published: '2026-08-11'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:21:54.847'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66776'
references:
  - url: 'https://me.sap.com/notes/3786038'
    label: cna@sap.com
  - url: 'https://url.sap/sapsecuritypatchday'
    label: cna@sap.com
tags:
  - nvd
epss: 0.002
epssPercentile: 0.08911
ingestedAt: '2026-09-08T21:11:12.274Z'
---

## Overview

SAP Approuter does not consistently enforce integrity verification on certain session-related request headers under specific conditions. An attacker with low privileges could send a specially crafted request that bypasses the integrity check and loads another user's session context. Successful exploitation requires the attacker to have previously observed matching session values out-of-band, which makes the attack complex to execute. This could result in a high impact on confidentiality and a low impact on integrity. There is no impact on availability.

## Affected

- `approuter < 23.0.0`

## Remediation

Upgrade past the affected range:

- `approuter 23.0.0`