---
cve: "CVE-2026-27690"
severity: "CRITICAL"
cvss: 9.1
epss: "0.7%"
vendor: "SAP_SE"
kev: false
exploited: false
published: "2026-07-14 01:16:17"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-09T11:31:19+01:00"
---

# CVE-2026-27690

> 9.1 CRITICAL

## Beschreibung

Due to an HTTP Request Smuggling vulnerability in SAP Approuter, an unauthenticated attacker could send a specially crafted HTTP request that leads to request-response desynchronization. This could result in the exposure of user responses and cause the system to become unavailable. This leads to a high impact on confidentiality and availability.

## CNA-Record (Kanon, cvelistV5)

- CNA: **sap**
- State: PUBLISHED
- Stand: 2026-07-14 12:46:07
- CNA-CVSS: **9.1** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-444** — Inconsistent Interpretation of HTTP Requests
  The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

## Angriffsmuster (CAPEC)

- [CAPEC-33 — HTTP Request Smuggling](https://capec.mitre.org/data/definitions/33.html) _(Severity: High)_
- [CAPEC-273 — HTTP Response Smuggling](https://capec.mitre.org/data/definitions/273.html) _(Severity: High)_

## BSI-Hinweise (deutsch)

- [SAP Patch Day Juli 2026](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2308) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in SAP Software ausnutzen, um Dateien zu manipulieren, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um einen SQL-Injection Angriff durchzuführen, um einen Cross-Site Scripting Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, und um beliebigen Programmcode auszuführen.

## Referenzen

- <https://me.sap.com/notes/3720138>
- <https://url.sap/sapsecuritypatchday>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-27690/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_