# CVE-2026-89107: SAP S/4HANA code injection in substitution/validation rules

Source: https://junglewise.ai/threats/cve-2026-89107-sap-s-4hana-manage-substitution-validation-rules-does-not  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-89107 · Severity: critical · CVSS 9.9 · Published 2026-10-13

SAP S/4HANA's substitution and validation rules feature does not properly validate input in its domain-specific scripting language, allowing authenticated users with specific privileges to execute arbitrary code. An attacker exploiting this could gain complete control of the system, compromising all data, transactions, and availability for organizations relying on SAP's core business software.

Technologies: [SAP S/4HANA](https://junglewise.ai/threats/technologies/s-4hana). Vendors: [SAP](https://junglewise.ai/threats/vendors/sap).

## Quick answers

**Is CVE-2026-89107 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-89107 being exploited in the wild.

**How severe is CVE-2026-89107?** Critical severity, with a CVSS score of 9.9, published 13 October 2026.

**Which products and versions are affected?** SAP S/4HANA.

**Is there a fix for CVE-2026-89107?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-89107 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-89107?** Check whether you run SAP S/4HANA. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The rule definition functionality in SAP S/4HANA fails to properly sanitize input before interpreting it as ABAP code, creating an injection vulnerability. An authenticated attacker with appropriate business privileges can submit crafted input that is executed as arbitrary ABAP code within the system, leading to full system compromise. The vulnerability affects the manage substitution/validation rules component.

## Affected products

- SAP S/4HANA

## Timeline

- 2026-10-13: disclosed

## References

- [https://me.sap.com/notes/3805589](https://me.sap.com/notes/3805589)
- [https://url.sap/sapsecuritypatchday](https://url.sap/sapsecuritypatchday)

## Related threats

- [SAP S/4HANA authorization bypass in business object modification](https://junglewise.ai/threats/cve-2026-89121-sap-s-4hana-does-not-perform-sufficient-instance-level)
- [SAP S/4HANA authorization bypass in Manage Bank Chains app](https://junglewise.ai/threats/cve-2026-76962-sap-s-4hana-authorization-bypass-in-manage-bank-chains-app)
- [SAP S/4HANA SQL injection in Intercompany Matching and Reconciliation](https://junglewise.ai/threats/cve-2026-44766-sap-s-4hana-sql-injection-in-intercompany-matching-and)
- [SAP S/4HANA ReDoS in third-party component](https://junglewise.ai/threats/cve-2026-66766-sap-s-4hana-redos-in-third-party-component)
- [SAP S/4HANA authorization bypass in Bank Statement reprocessing](https://junglewise.ai/threats/cve-2026-66764-sap-s-4hana-authorization-bypass-in-bank-statement-reprocessing)