CVE-2026-27679

Vulnerability

Overview The SAP S/4HANA frontend OData Service for Manage Reference Structures contains missing authorization checks. This flaw allows an attacker to update or delete child entities through exposed OData services without the necessary authorization verification [1]. The vulnerability affects the integrity of affected systems, while confidentiality and availability remain uncompromised.

Attack

Vector An attacker can exploit this vulnerability by sending crafted requests to the vulnerable OData service endpoints. No special network position or prior authentication is required beyond what is necessary to reach the service. The attack surface is the OData service itself, which is exposed to frontend users [1].

Impact

Successful exploitation leads to unauthorized modification or deletion of child entities managed by the service. The integrity impact is rated high, meaning data can be improperly altered or removed. The CVSS v3 base score is 6.5 (Medium) due to the integrity impact without confidentiality or availability impact [1].

Mitigation

SAP has released security patches as part of its regular Security Patch Day cycle. Customers should apply the relevant SAP Security Notes to correct the missing authorization checks [1]. SAP recommends prioritizing implementation of these corrections, especially for medium severity notes like this one, which include fixes in the newest support package for mainstream and extended maintenance releases.