CVE-2026-109805
NVDCVSS scored by cna@sap.com
Vulnerability Summary
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.
CVSS v3.1 Base Metrics — Score 6.4 (MEDIUM)
CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:HAttack VectorAdjacent
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected & Patched Versions
Not provided by NVD for this CVE.
No patched version published yet
Until a fix ships, reduce exposure:
- Restrict access to the affected service or interface to trusted networks.
- Disable the affected feature if you do not need it.
- Watch the vendor advisory for a firmware or software update.
What to do
Fix it during your normal patch cycle. No exploitation is confirmed yet.
- Check whether you run the affected product and which version.
- No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
- Subscribe to the vendor advisory so you learn when a fix ships.
Timeline
- Nov 10, 2026Published
- Nov 12, 2026Record last modified
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
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Set up CVE alertsExternal References
- Referencehttps://me.sap.com/notes/3786876
- Referencehttps://url.sap/sapsecuritypatchday
Data last checked: Nov 14, 2026 01:09 UTC