CVE-2026-27688: SAP NetWeaver Privilege Escalation Flaw

CVE-2026-27688 Overview

CVE-2026-27688 is a Missing Authorization vulnerability (CWE-862) affecting SAP NetWeaver Application Server for ABAP. Due to a missing authorization check, an authenticated attacker with user privileges could read Database Analyzer Log Files via a specific RFC function module. The attacker with the necessary privileges to execute this function module could potentially escalate their privileges and read sensitive data, resulting in a limited impact on the confidentiality of the information stored. However, the integrity and availability of the system are not affected.

Critical Impact

Authenticated attackers can exploit missing authorization checks to access Database Analyzer Log Files containing potentially sensitive system information, enabling unauthorized data exposure and potential privilege escalation.

Affected Products

• SAP NetWeaver Application Server for ABAP

Discovery Timeline

• March 10, 2026 - CVE-2026-27688 published to NVD
• March 11, 2026 - Last updated in NVD database

Technical Details for CVE-2026-27688

Vulnerability Analysis

This vulnerability stems from a Missing Authorization (CWE-862) flaw in SAP NetWeaver Application Server for ABAP. The affected system fails to properly validate user authorization before allowing access to Database Analyzer Log Files through a specific RFC (Remote Function Call) function module.

In SAP systems, RFC function modules enable remote procedure calls between SAP systems and external applications. When authorization checks are missing or improperly implemented, attackers who have basic authenticated access to the system can invoke these function modules to access resources beyond their intended permissions.

The vulnerability allows authenticated users to read Database Analyzer Log Files, which may contain sensitive operational data about database performance, queries, and system configurations. While the direct impact is limited to information disclosure without affecting system integrity or availability, the exposed data could facilitate further attacks or reconnaissance activities.

Root Cause

The root cause is a missing authorization check in the SAP NetWeaver Application Server for ABAP component. The specific RFC function module responsible for handling Database Analyzer Log File access does not properly verify whether the calling user has the appropriate authorization objects or roles to access this data. This allows any authenticated user with execution privileges for the function module to bypass intended access controls.

Attack Vector

The attack is network-based and requires authentication with basic user privileges. An attacker must:

1. Obtain valid credentials for the SAP NetWeaver ABAP system
2. Identify and execute the vulnerable RFC function module
3. Retrieve Database Analyzer Log Files without proper authorization validation

The attacker exploits the missing authorization check by invoking the RFC function module through standard SAP communication protocols. Since the function module lacks proper authorization validation, it returns sensitive log file contents regardless of whether the user should have access to this data.

Detection Methods for CVE-2026-27688

Indicators of Compromise

• Unusual access patterns to Database Analyzer Log Files from non-administrative users
• Unexpected RFC function module calls from user accounts that typically do not perform database analysis tasks
• Anomalous read operations on system log files by accounts without BASIS or DBA roles
• Increased frequency of specific RFC calls that correlate with log file access

Detection Strategies

• Monitor SAP Security Audit Log (SM21) for unauthorized RFC function module invocations
• Implement transaction logging for sensitive RFC modules and analyze access patterns
• Configure SentinelOne Singularity to detect anomalous SAP NetWeaver activity patterns
• Review SAP Gateway logs for suspicious remote function call activity targeting database-related modules

Monitoring Recommendations

• Enable enhanced logging for RFC function module executions in SAP NetWeaver
• Configure alerts for Database Analyzer Log File access by non-privileged users
• Implement SentinelOne behavioral analysis to detect privilege escalation attempts
• Establish baseline activity patterns for RFC module usage to identify deviations

How to Mitigate CVE-2026-27688

Immediate Actions Required

• Apply the security patch documented in SAP Note #3704740 immediately
• Review and restrict user authorizations for the affected RFC function module
• Audit user roles and remove unnecessary privileges to execute database-related RFC modules
• Enable enhanced monitoring for Database Analyzer Log File access

Patch Information

SAP has released a security patch addressing this vulnerability. Administrators should consult SAP Note #3704740 for detailed patch instructions and download links. Additionally, the SAP Security Patch Day page provides comprehensive information about this and related security updates.

Organizations should prioritize patching based on their exposure to network-accessible SAP systems and the sensitivity of data stored in Database Analyzer Log Files.

Workarounds

• Restrict access to the vulnerable RFC function module by modifying authorization objects in transaction SU24
• Implement additional authorization checks using SAP Access Control mechanisms
• Limit network access to SAP RFC interfaces using firewall rules and network segmentation
• Consider disabling the affected function module if Database Analyzer functionality is not required

* Authorization check workaround example
* Add to affected RFC function module or via enhancement
AUTHORITY-CHECK OBJECT 'S_TABU_DIS'
  ID 'DICBERCLS' FIELD 'SS'
  ID 'ACTVT'     FIELD '03'.

IF sy-subrc <> 0.
  RAISE EXCEPTION TYPE cx_no_authority.
ENDIF.