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Fencer Intel
critical 10.0

CVE-2026-89111 json

OAuth2 SSRF vulnerability in SAP Cloud SDK for Python

published 30d ago modified 8d ago also EUVD-2026-98193 , GHSA-4mv3-jxxm-9cx2

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository SAP/cloud-sdk-python. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • SAP_SE SAP Cloud 0.55.1

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
28d ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

  • SAP_SE SAP Cloud

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of SAP/cloud-sdk-python published their own advisory on GitHub. Reviewed sources take precedence over it.