SAP NetWeaver Application Server ABAP and ABAP…: Missing Authorization
CVE-2026-0509 is a critical-severity missing authorization vulnerability in SAP NetWeaver Application Server ABAP and ABAP Platform from SAP, with a CVSS 3.1 base score of 9.6 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected SAP NetWeaver Application Server ABAP and ABAP Platform versions: KRNL64NUC 7.22; 7.22EXT; KRNL64UC 7.22, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.37% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of SAP NetWeaver Application Server ABAP and ABAP Platform you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on url.sap for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| SAP | SAP NetWeaver Application Server ABAP and ABAP Platform | KRNL64NUC 7.22; 7.22EXT; KRNL64UC 7.22; 7.53; KERNEL 7.22; 7.54; 7.77; 7.89; and 4 more ranges | Not stated |
| SAP | Netweaver As Abap Kernel | 7.22; 7.53; 7.54; 7.77; 7.89; 7.93; 9.16; 9.18; and 1 more ranges | Not stated |
| SAP | Netweaver As Abap Krnl64nuc | 7.22; 7.22ext | Not stated |
| SAP | Netweaver As Abap Krnl64uc | 7.22; 7.22ext; 7.53 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H. Scored by CNA (sap.com).
Official description
SAP NetWeaver Application Server ABAP and ABAP Platform allows an authenticated, low-privileged user to perform background Remote Function Calls without the required S_RFC authorization in certain cases. This can result in a high impact on integrity and availability, and no impact on the confidentiality of the application.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Missing Authorization
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
How developers prevent this class of flaw
- Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries. Note that this approach may not protect against horizontal authorization, i.e., it will not protect a user from attacking others with the same role.
- Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records. For example, a database may restrict access for medical records to a specific database user, but each record might only be intended to be accessible to the patient and the patient's doctor.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using authorization frameworks such as the JAAS Authorization Framework and the OWASP ESAPI Access Control feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other references
- me.sap.com/notes/3674774Permissions Required
Other vulnerabilities in SAP NetWeaver Application Server ABAP and ABAP Platform
- 8.1 High severity
- 9.6 Critical severity
- 9.4 Critical severity
- 8.7 High severity
Recent Missing Authorization vulnerabilities
- 7.2 High severity
- 7.7 High severity
- 7.5 High severity
- 9.9 Critical severity
- 7.2 High severity
- 9.1 Critical severity
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