# CVE-2026-27690 — SAP_SE SAP Approuter

> As of 2026-07-14, CVE-2026-27690 is a CRITICAL-severity vulnerability in SAP_SE SAP Approuter, CVSS v3.1 9.1. Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2026-27690, most recently “CVE-2026-44747: Critical Memory Corruption in SAP NetWeaver Application Server ABAP (CVSS 9.9)”.

**Last updated:** 2026-07-14

## What is CVE-2026-27690?

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.

The record classifies CVE-2026-27690 under weakness class [CWE-444](https://cwe.mitre.org/data/definitions/444.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 61 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-14

## Is CVE-2026-27690 being exploited?

No public exploitation evidence for CVE-2026-27690 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-14. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- **SAP_SE**: SAP Approuter

## How to fix CVE-2026-27690

No vendor patch reference has been recorded for CVE-2026-27690 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-27690

4 tracked threats in the Threadlinqs corpus reference CVE-2026-27690, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-44747: Critical Memory Corruption in SAP NetWeaver Application Server ABAP (CVSS 9.9)](https://intel.threadlinqs.com/threat/TL-2026-1438) — CRITICAL · 2026-07-17
- [SAP Patches Critical NetWeaver, Approuter, and Commerce Cloud Flaws (CVE-2026-44747, CVE-2026-27690, CVE-2026-44761)](https://intel.threadlinqs.com/threat/TL-2026-1302) — CRITICAL · 2026-07-14
- [SAP July 2026 Patch Day: Critical Memory Corruption in NetWeaver ABAP (CVE-2026-44747, CVSS 9.9) Among 16 Security Notes](https://intel.threadlinqs.com/threat/TL-2026-1303) — CRITICAL · 2026-07-14
- [SAP Patches CVSS 9.9 NetWeaver ABAP Out-of-Bounds Write Flaw (CVE-2026-44747), Plus Critical Approuter and Commerce Cloud Bugs](https://intel.threadlinqs.com/threat/TL-2026-1329) — CRITICAL · 2026-07-14

## Sources

Enriched from CVE.org, NVD, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-14. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [me.sap.com](https://me.sap.com/notes/3720138)
- [url.sap](https://url.sap/sapsecuritypatchday)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-27690
Full detection coverage and IOCs for threats exploiting CVE-2026-27690 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp