Advisory
On 10.03.2026 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within ABAP.
SAP Note 3665042 addresses "CSS Injection vulnerability in SAP NetWeaver Application Server ABAP" to prevent css injection with a low risk for exploitation.
A workaround does exist, according to SAP Security Advisory team. It is advisable to implement the correction as none, the team suggests.
Missing authority checks are still the most common security defect related to authorizations in custom code. Since SAP uses an explicit authorization model, an authority checks must be coded in order to be executed. If an explicit check is not coded, all users have access. This type of vulnerability not only exists in SAP standard it also exists in customer coding. Check your custom developments for vulnerabilities that pose a risk to your systems. SecurityBridge helps detect code vulnerabilities before they are implemented in production.
Risk specification
Under certain conditions, SAP NetWeaver Application Server ABAP allows an attacker to inject custom Cascading Style Sheets (CSS) data into a web page served by the application server. Common impacts of information disclosure include: - Loss of information and system configuration confidentiality - Information gathering for further exploits and attacks
Solution
With this correction, custom CSS data is now restricted to be loaded only from the same domain. The correction was delivered with the Cumulative Patch for Unified Rendering 2511. To apply the correction, install at least Unified Rendering 2511. For further information, see SAP Note 3660426 for the corresponding framework patches to be installed and details about the patch process. Circumstances exist that prevent the timely installation of a patch provided by the manufacturer. In such cases, you may consider applying the suggested workaround as a temporary or compensating mitigation: "None".
Affected System
The advisory 3665042 describes a problem within an ABAP based systems of a specific version. Affected versions are described below. ABAP software is deployed in various software components and is widely used within the SAP product portfolio.
SAP NetWeaver Application Server (formally known as SAP Web Application Server) is a building block of SAP NetWeaver. It is the foundation for most software products developed by SAP SE. SAP NetWeaver systems exist with Java and/or ABAP stacks. The advisory could be relevant for single and dual-stack ABAP installations.
The advisory is valid for
- SAP_UI 758 7
- SAP_UI 816
