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SAP GUI for Java CVE-2026-66768

| EUVDEUVD-2026-72577 CRITICAL
Reliance on Untrusted Inputs in a Security Decision (CWE-807)
2026-09-08 sap GHSA-rjmq-hvpj-4qrc
9.0
CVSS 3.1 · Vendor: sap
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Severity by source

Vendor (sap) PRIMARY
9.0 CRITICAL
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative
vuln.today AI
9.0 CRITICAL

Backend foothold gives PR:L, victim must interact (UI:R), the compromised backend crosses trust boundary to the client (S:C), and command execution yields C:H/I:H/A:H.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (sap).

CVSS VectorVendor: sap

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Metadata Corrected
Sep 08, 2026 - 01:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Sep 08, 2026 - 01:03 vuln.today
CVE Published
Sep 08, 2026 - 00:11 cve.org
CRITICAL 9.0

DescriptionCVE.org

SAP GUI for Java does not correctly enforce the trust level policy for certain functions invoked from a connected backend system. A low-privileged attacker could exploit this weakness by manipulating a connected backend system to trigger affected functionality. This could allow arbitrary command execution on the victim's machine, leading to a high impact on the confidentiality, integrity, and availability of the affected system.

AnalysisAI

Arbitrary command execution in SAP GUI for Java arises because the client does not correctly enforce its trust-level policy for certain functions that a connected backend can invoke. A low-privileged attacker who controls or compromises a backend SAP system can trigger the affected client-side functionality to run commands on the connected user's workstation, with high impact to confidentiality, integrity, and availability. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a connected backend SAP system that the attacker can manipulate or control (consistent with PR:L) and a victim who actively connects and interacts with that backend via SAP GUI for Java (UI:R). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are internally consistent for a serious client-side RCE: AV:N/AC:L means the trigger crosses the network from the backend with low complexity; PR:L reflects that the attacker needs some foothold on/into a connected backend; UI:R means a user must be connected and interacting with the malicious server; and S:C with C:H/I:H/A:H captures that a compromised backend crosses a trust boundary to fully compromise a separate client workstation, which is what drives the 9.0. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the fix described in SAP Security Note 3781729 (https://me.sap.com/notes/3781729), published through SAP Security Patch Day (https://url.sap/sapsecuritypatchday) - Patch available per vendor advisory; the exact fixed version is not stated in the provided data and should be taken from the SAP Note (authenticated SAP customer access required). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, audit all SAP GUI for Java installations and document backend connectivity across the enterprise. …

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CVE-2026-66768 vulnerability details – vuln.today

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