Vulnerability-Lookup

CNVD-2026-31556

Vulnerability from cnvd - Published: 2026-08-12

Title

Microsoft Office越界读取漏洞（CNVD-2026-31556）

Description

Microsoft Office是一款办公软件套件，提供文档处理、表格计算、演示文稿及协作等功能。 Microsoft Office存在越界读取漏洞，该漏洞源于程序未能正确验证内存边界，攻击者可利用该漏洞在本地泄露敏感信息。

Severity

中

Patch Name

Microsoft Office越界读取漏洞（CNVD-2026-31556）的补丁

Patch Description

Microsoft Office是一款办公软件套件，提供文档处理、表格计算、演示文稿及协作等功能。 Microsoft Office存在越界读取漏洞，该漏洞源于程序未能正确验证内存边界，攻击者可利用该漏洞在本地泄露敏感信息。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55023

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-55023

Impacted products

Name
['Microsoft Microsoft SharePoint Server 2019', 'Microsoft Microsoft SharePoint Enterprise Server 2016', 'Microsoft Microsoft SharePoint Server Subscription Edition', 'Microsoft Microsoft 365 Apps for Enterprise', 'Microsoft Microsoft Office LTSC 2021', 'Microsoft Microsoft Office 2019', 'Microsoft Microsoft Office LTSC for Mac 2021', 'Microsoft Microsoft Office 2016', 'Microsoft Microsoft Office LTSC 2024', 'Microsoft Microsoft Office LTSC for Mac 2024', 'Microsoft Microsoft Office 365 for Mac']

Name

['Microsoft Microsoft SharePoint Server 2019', 'Microsoft Microsoft SharePoint Enterprise Server 2016', 'Microsoft Microsoft SharePoint Server Subscription Edition', 'Microsoft Microsoft 365 Apps for Enterprise', 'Microsoft Microsoft Office LTSC 2021', 'Microsoft Microsoft Office 2019', 'Microsoft Microsoft Office LTSC for Mac 2021', 'Microsoft Microsoft Office 2016', 'Microsoft Microsoft Office LTSC 2024', 'Microsoft Microsoft Office LTSC for Mac 2024', 'Microsoft Microsoft Office 365 for Mac']

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-55023",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-55023"
    }
  },
  "description": "Microsoft Office\u662f\u4e00\u6b3e\u529e\u516c\u8f6f\u4ef6\u5957\u4ef6\uff0c\u63d0\u4f9b\u6587\u6863\u5904\u7406\u3001\u8868\u683c\u8ba1\u7b97\u3001\u6f14\u793a\u6587\u7a3f\u53ca\u534f\u4f5c\u7b49\u529f\u80fd\u3002\n\nMicrosoft Office\u5b58\u5728\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u5185\u5b58\u8fb9\u754c\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u672c\u5730\u6cc4\u9732\u654f\u611f\u4fe1\u606f\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55023",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-31556",
  "openTime": "2026-08-12",
  "patchDescription": "Microsoft Office\u662f\u4e00\u6b3e\u529e\u516c\u8f6f\u4ef6\u5957\u4ef6\uff0c\u63d0\u4f9b\u6587\u6863\u5904\u7406\u3001\u8868\u683c\u8ba1\u7b97\u3001\u6f14\u793a\u6587\u7a3f\u53ca\u534f\u4f5c\u7b49\u529f\u80fd\u3002\r\n\r\nMicrosoft Office\u5b58\u5728\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1\u5185\u5b58\u8fb9\u754c\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5728\u672c\u5730\u6cc4\u9732\u654f\u611f\u4fe1\u606f\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Microsoft Office\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\uff08CNVD-2026-31556\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Microsoft Microsoft SharePoint Server 2019",
      "Microsoft Microsoft SharePoint Enterprise Server 2016",
      "Microsoft Microsoft SharePoint Server Subscription Edition",
      "Microsoft Microsoft 365 Apps for Enterprise",
      "Microsoft Microsoft Office LTSC 2021",
      "Microsoft Microsoft Office 2019",
      "Microsoft Microsoft Office LTSC for Mac 2021",
      "Microsoft Microsoft Office 2016",
      "Microsoft Microsoft Office LTSC 2024",
      "Microsoft Microsoft Office LTSC for Mac 2024",
      "Microsoft Microsoft Office 365 for Mac"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-55023",
  "serverity": "\u4e2d",
  "submitTime": "2026-07-15",
  "title": "Microsoft Office\u8d8a\u754c\u8bfb\u53d6\u6f0f\u6d1e\uff08CNVD-2026-31556\uff09"
}

CVE-2026-55023 (GCVE-0-2026-55023)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:08 – Updated: 2026-08-20 17:04

Title

Microsoft Office Information Disclosure Vulnerability

Summary

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-14 19:05 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

microsoft mitre root

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

11 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office 2016	Affected: 16.0.0 , < 16.0.5561.1000 (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office 365 for Mac	Affected: 1.0.0 , < 16.111.26071215 (custom)
Microsoft	Microsoft Office LTSC 2021	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC 2024	Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office LTSC for Mac 2021	Affected: 16.0.1 , < 16.111.26071215 (custom)
Microsoft	Microsoft Office LTSC for Mac 2024	Affected: 16.0.0 , < 16.111.26071215 (custom)
Microsoft	Microsoft SharePoint Enterprise Server 2016	Affected: 16.0.0 , < 16.0.5561.1001 (custom)
Microsoft	Microsoft SharePoint Server 2019	Affected: 16.0.0 , < 16.0.10417.20175 (custom)
Microsoft	Microsoft SharePoint Server Subscription Edition	Affected: 16.0.0 , < 16.0.19725.20434 (custom)

Date Public

2026-07-14 14:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55023",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-14T19:05:05.711879Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-14T19:05:13.806Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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          ],
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          "vendor": "Microsoft",
          "versions": [
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              "status": "affected",
              "version": "19.0.0",
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              "status": "affected",
              "version": "16.0.0",
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        },
        {
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          "vendor": "Microsoft",
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        },
        {
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        },
        {
          "platforms": [
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          ],
          "product": "Microsoft SharePoint Enterprise Server 2016",
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          "versions": [
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        {
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        },
        {
          "platforms": [
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          ],
          "product": "Microsoft SharePoint Server Subscription Edition",
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          "versions": [
            {
              "lessThan": "16.0.19725.20434",
              "status": "affected",
              "version": "16.0.0",
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        }
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      },
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        {
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          "tags": [
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          ],
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        }
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      "title": "Microsoft Office Information Disclosure Vulnerability"
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    "datePublished": "2026-07-14T17:08:36.677Z",
    "dateReserved": "2026-06-16T14:12:44.284Z",
    "dateUpdated": "2026-08-20T17:04:54.753Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CNVD-2026-31556

CVE-2026-55023 (GCVE-0-2026-55023)

Tags

Sightings

Nomenclature