CVE-2026-89111
Published:October 13, 2026
Updated:November 03, 2026
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.
Affected Packages
https://github.com/SAP/cloud-sdk-python.git (GITHUB):
Affected version(s) >=v0.1.0 <v0.45.2Fix Suggestion:
Update to version v0.45.2https://github.com/SAP/cloud-sdk-python.git (GITHUB):
Affected version(s) >=v0.53.0 <v0.55.1Fix Suggestion:
Update to version v0.55.1sap-cloud-sdk (PYTHON):
Affected version(s) >=0.53.0 <0.55.1Fix Suggestion:
Update to version 0.55.1sap-cloud-sdk (PYTHON):
Affected version(s) >=0.1.0 <0.45.2Fix Suggestion:
Update to version 0.45.2Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Server-Side Request Forgery
EPSS
Base Score:
0.37