CVSS 10 Flaw in SAP SDK for Python: OAuth2 Credential Theft

SAP has published a security advisory acknowledging a maximum-severity vulnerability (CVSS 10) in its Cloud SDK for Python, the official client that many applications use to integrate with SAP Business Technology Platform (BTP) services. The flaw allows an application's OAuth2 client credentials to end up on a server controlled by an attacker, which in practice amounts to handing over the access key to the company's cloud services.

The problem specifically affects multi-tenant applications deployed on BTP that use this SDK. According to SAP's advisory, the attacker needs to be able to control the tenant's subdomain to redirect authentication traffic to their own infrastructure. In other words, it is not a flaw that can be exploited massively and blindly, but rather a condition that fits scenarios involving a misconfigured tenant, compromised subdomains, or external providers with control over DNS.

What lies behind the CVSS 10

A CVSS of 10 does not mean that anyone can attack us from the internet just like that. It means that, given the right conditions, the impact is total: confidentiality, integrity, and availability of the data and services involved are exposed. In this case, the direct consequence is the theft of OAuth2 credentials, which are the standard mechanism by which applications authenticate against APIs and cloud services without directly handling usernames and passwords.

If those credentials fall into the wrong hands, the attacker can impersonate the legitimate application before SAP services and, depending on the permissions granted, read data, modify information, or execute operations on behalf of the company. In a multi-tenant BTP environment, the risk multiplies because a single application serves multiple customers or business units.

Why this matters to an SME

It may seem like a problem for large corporations, but it is not. More and more Spanish SMEs deploy integrations on SAP BTP, either directly or through partners that build extensions, portals, or automations in Python. The SDK for Python is a common piece in that type of development.

Furthermore, the underlying pattern is familiar to us: applications and agents that authenticate with service credentials and that, if not managed rigorously, become a blind spot. It is the same logic we already discussed in AI Agents without traceability: the identity hole in your SME: machine identity is as critical as human identity, and it often receives much less attention.

What we recommend doing

The first thing is not to panic, but to move in an orderly fashion. These are the actions we propose to our clients:

1. Inventory the use of the SDK. Locate all applications, scripts, and serverless functions that use SAP's Cloud SDK for Python, especially if they are multi-tenant on BTP.
2. Review the subdomain configuration. Verify who controls the tenant's subdomain and whether there are DNS delegations, external providers, or test environments with similar names.
3. Apply the updates indicated by SAP. Follow the official advisory and update the SDK to the corrected version as soon as it is available for our environment.
4. Rotate OAuth2 credentials. If there is the slightest suspicion of exposure, regenerate client secrets and review the granted scopes to apply the principle of least privilege.
5. Monitor anomalous access. Review authentication logs and API calls for strange patterns, especially from unusual IPs.

It is worth linking this review with the broader identity and automation strategy we have been discussing in SAP accelerates toward the autonomous enterprise: Joule and AI agents. The more we delegate to agents and services that authenticate on their own, the more important it is that those credentials are well managed, rotated, and audited.

A wake-up call about the supply chain

This case reminds us that an SME's security does not depend only on what it does, but also on the SDKs, libraries, and platforms it integrates. A flaw in a manufacturer's official client can become a real breach if the surrounding configuration is not adequate.

The lesson is not to distrust SAP, but to assume that every external dependency requires review, updating, and identity control.

Our final recommendation is simple: let us treat service credentials with the same rigor as user passwords, maintain a living inventory of integrations, and not leave SDK updates on the to-do list. In a cloud environment, identity is the new perimeter.

Source: The Hacker News. Analysis and adaptation: ForgeNEX.