# CVE-2026-109805: Weak Cryptography in SAP NetWeaver and ABAP Platform (Application Server ABAP)

Status: published. Published: 2026-11-10. Updated: 2026-11-10.

Due to a weak HMAC cryptography calculation when receiving an RFC callback in SAP NetWeaver and ABAP Platform (Application Server ABAP), an authenticated attacker with high privileges and access to a network segment between application servers on an SAP system could intercept network communication between application servers and change the identity of the caller, enabling the execution of unauthorized function calls on the target server with escalated privileges leading to High impact on Confidentiality, Integrity, and Availability of the application.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- SAP_SE / SAP NetWeaver and ABAP Platform (Application Server ABAP): KRNL64NUC 7.22 (affected); 7.22EXT (affected); KRNL64UC 7.22 (affected); 7.53 (affected); KERNEL 7.22 (affected); 7.54 (affected); 7.77 (affected); 7.93 (affected); 9.16 (affected); 9.20 (affected); 9.21 (affected). Source: CNA: sap

## Severity and prioritization

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H; source: CNA: sap

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-328

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://me.sap.com/notes/3786876 (CNA: sap)

- https://url.sap/sapsecuritypatchday (CNA: sap)

## Provenance

- CNA: sap: https://www.cve.org/CVERecord?id=CVE-2026-109805; retrieved 2026-11-10; source updated 2026-11-10

Revision: 0e7988c7dec6bf81376d435e37816d9b84636bca52bc9929c45a4f6ff22a693b

Canonical: https://y2.dev/cve/CVE-2026-109805

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