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ABAP Code Injection in SAP S/4HANA Manage Substitution/Validation Rules
CVE-2026-89107 is a code injection vulnerability in SAP S/4HANA's Manage Substitution/Validation Rules functionality. Insufficient validation of input supplied through the domain-specific scripting language used for rule definitions allows an authenticated attacker with specific business privileges to submit crafted input that the rule-processing logic interprets as executable ABAP code. Successful exploitation can result in arbitrary ABAP code execution and full compromise of the affected system. The vulnerability has a reported CVSS v3.1 score of 9.9.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation can fully compromise the affected SAP S/4HANA system, with high impacts on confidentiality, integrity, and availability. Arbitrary ABAP code execution can enable unauthorized access to sensitive application data, modification of data and application behavior, and disruption of system operations.
If you can’t patch tonight, do this now.
No vulnerability-specific workaround is documented in the available information. Pending patch deployment, restrict access to Manage Substitution/Validation Rules and limit the business privileges required to define or modify rules to trusted users.
Patch, then assume compromise.
Apply the applicable SAP security updates identified in SAP Security Note 3805589, associated with the October 13, 2026 Security Patch Day. Consult the note for affected releases, patch prerequisites, and installation instructions. Specific affected and fixed version numbers are not available.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.