What is CVE-2026-27690?

CVE-2026-27690 is a critical-severity vulnerability in SAP Se Approuter, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.1/10. Published 2026-07-14.

How severe is CVE-2026-27690?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in SAP Se Approuter

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.

Vulnerability class: HTTP Request Smuggling

EPSS: 0.007 (49.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Sap_se Sap Approuter — versions SAP Approuter node.js package < 20.10.0

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

Frequently asked questions

What is CVE-2026-27690?: CVE-2026-27690 is a critical-severity vulnerability in SAP Se Approuter, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.1/10. Published 2026-07-14.
How severe is CVE-2026-27690?: Critical severity. CVSS v3 base score is 9.1 out of 10.