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10.0 Critical

The SAP Cloud SDK for Python contains an OAuth2 SSRF vulnerability affecting multi-tenant BTP applications.

CVE-2026-89111

The SAP Cloud SDK for Python contains an OAuth2 SSRF vulnerability affecting multi-tenant BTP applications. An attacker who controls the tenantsubdomain 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.

Assessment

CVSS
10 (v3.1)
Severity
Critical
EPSS
0.37% chance of exploitation in the next 30 days
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
13 October 2026
Last updated
3 November 2026
Affected
SAP_SE · SAP Cloud
Assigner
sap

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

At the source

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