CVE-2026-89111

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OAuth2 SSRF in SAP Cloud SDK for Python

Publication date: 2026-10-13

Last updated on: 2026-11-03

Assigner: SAP SE

Description

The SAP Cloud SDK for Python contains an OAuth2 SSRF vulnerability affecting multi-tenant BTP applications. An attacker who controls the tenant_subdomain parameter can redirect OAuth2 token requests to an attacker-controlled server, causing client credentials to be exfiltrated. This vulnerability was originally fixed in 0.45.2. It was reintroduced in 0.53.0 when the HTTP client was refactored into a shared core module, and the tenant subdomain validation was not carried over to the new location. The validation was restored in 0.55.1.

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Meta Information

Published

2026-10-13

Last Modified

2026-11-03

Generated

2026-11-08

AI Q&A

2026-10-13

EPSS Evaluated

2026-11-07

NVD

CVE-2026-89111

EUVD

EUVD-2026-98193

Affected Vendors & Products

Vendor	Product	Version / Range
SAP_SE	SAP Cloud	sap-cloud-sdk < 0.45.2

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

This vulnerability is an OAuth2 SSRF (Server-Side Request Forgery) flaw in the SAP Cloud SDK for Python. It affects multi-tenant BTP (Business Technology Platform) applications. An attacker who controls the tenant_subdomain parameter can manipulate OAuth2 token requests to redirect them to a server under their control, leading to the exfiltration of client credentials.

Detection Guidance

To detect this vulnerability, monitor network traffic for unexpected OAuth2 token requests to external servers. Check if tenant_subdomain values in requests deviate from expected RFC 1123 DNS label rules. Inspect logs for token exfiltration attempts or unauthorized credential exposure. Validate SDK version is 0.45.2 or later.

Impact Analysis

If exploited, this vulnerability allows attackers to steal OAuth2 client credentials. This could lead to unauthorized access to sensitive data, impersonation of legitimate users or services, and potential compromise of the entire multi-tenant application environment.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face legal penalties, reputational damage, and loss of customer trust due to non-compliance with these regulations.

Mitigation Strategies

Apply the latest SAP Security Notes for the Cloud SDK for Python as soon as possible. Monitor SAP Security Notes updates from SAP for patches related to this vulnerability.

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