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CVE-2026-89111

OAuth2 SSRF vulnerability in SAP Cloud SDK for Python

Critical10.0EPSS 0.37%
Published
Updated
Reserved
Assigned by
sap

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.

Scores

CVSS scores of CVE-2026-89111, by who scored it
Scored byCVSSScoreVector
sapCNA (assigner)3.1Critical10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
NVDNVD · Awaiting Analysis3.1Critical10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.37% · top 69% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 10.0.

Weakness

Affected products

  • SAP_SE · SAP Cloud

    • affected sap-cloud-sdk < 0.45.2
    • affected >=0.53.0 – < 0.55.1

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .