Vulnerability-Lookup

MSRC_CVE-2026-35440

Vulnerability from csaf_microsoft - Published: 2026-05-12 07:00 - Updated: 2026-05-12 07:00

Summary

Microsoft Word Information Disclosure Vulnerability

Severity

Important

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.

CVE-2026-35440

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

CWE-552 - Files or Directories Accessible to External Parties

Affected products

Fixed 10 products

Product	Identifier	Version	Remediation
Microsoft Word 2016 (32-bit edition) 16.0.5552.1000 Microsoft Word 2016 (32-bit edition)		16.0.5552.1000
Microsoft Word 2016 (64-bit edition) 16.0.5552.1000 Microsoft Word 2016 (64-bit edition)		16.0.5552.1000
Microsoft Office 2019 for 32-bit editions https://aka.ms/OfficeSecurityReleases Microsoft Office 2019 for 32-bit editions		https://aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 64-bit editions https://aka.ms/OfficeSecurityReleases Microsoft Office 2019 for 64-bit editions		https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 32-bit Systems https://aka.ms/OfficeSecurityReleases Microsoft 365 Apps for Enterprise for 32-bit Systems		https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 64-bit Systems https://aka.ms/OfficeSecurityReleases Microsoft 365 Apps for Enterprise for 64-bit Systems		https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 64-bit editions https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2021 for 64-bit editions		https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 32-bit editions https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2021 for 32-bit editions		https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 32-bit editions https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2024 for 32-bit editions		https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 64-bit editions https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2024 for 64-bit editions		https://aka.ms/OfficeSecurityReleases

Known affected 10 products

Product	Version	Remediation
Microsoft Office LTSC 2024 for 64-bit editions <https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2024 for 64-bit editions	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft Office LTSC 2024 for 32-bit editions <https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2024 for 32-bit editions	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft Office LTSC 2021 for 32-bit editions <https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2021 for 32-bit editions	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft Office LTSC 2021 for 64-bit editions <https://aka.ms/OfficeSecurityReleases Microsoft Office LTSC 2021 for 64-bit editions	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft 365 Apps for Enterprise for 64-bit Systems <https://aka.ms/OfficeSecurityReleases Microsoft 365 Apps for Enterprise for 64-bit Systems	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft 365 Apps for Enterprise for 32-bit Systems <https://aka.ms/OfficeSecurityReleases Microsoft 365 Apps for Enterprise for 32-bit Systems	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft Office 2019 for 64-bit editions <https://aka.ms/OfficeSecurityReleases Microsoft Office 2019 for 64-bit editions	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft Office 2019 for 32-bit editions <https://aka.ms/OfficeSecurityReleases Microsoft Office 2019 for 32-bit editions	<https://aka.ms/OfficeSecurityReleases	Vendor Fix fix
Microsoft Word 2016 (64-bit edition) <16.0.5552.1000 Microsoft Word 2016 (64-bit edition)	<16.0.5552.1000	Vendor Fix fix
Microsoft Word 2016 (32-bit edition) <16.0.5552.1000 Microsoft Word 2016 (32-bit edition)	<16.0.5552.1000	Vendor Fix fix

Threats

Impact Information Disclosure

Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely

References

7 references

URL	Category
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self
https://www.microsoft.com/en-us/msrc/exploitabili…	external
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self

Acknowledgments

tiebuchen

JSON

To clipboard

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          "category": "faq",
          "text": "The type of information that could be disclosed if an attacker successfully exploited this vulnerability is the local memory address.",
          "title": "What type of information could be disclosed by this vulnerability?"
        },
        {
          "category": "faq",
          "text": "No, the Preview Pane is not an attack vector.",
          "title": "Is the Preview Pane an attack vector for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An attacker must send a user a malicious email and convince a user to reply it.",
          "title": "According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?"
        }
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          "8",
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          "date": "2026-05-12T07:00:00.000Z",
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            "7",
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          "product_ids": [
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            "9"
          ],
          "url": "https://support.microsoft.com/help/5002858"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 4.8,
            "userInteraction": "REQUIRED",
            "vectorString": "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",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Information Disclosure"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Microsoft Word Information Disclosure Vulnerability"
    }
  ]
}

CVE-2026-35440 (GCVE-0-2026-35440)

Vulnerability from cvelistv5 – Published: 2026-05-12 16:58 – Updated: 2026-05-14 18:08

Title

Microsoft Word Information Disclosure Vulnerability

Summary

Files or directories accessible to external parties in Microsoft Office Word 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

CWE

CWE-552 - Files or Directories Accessible to External Parties

Assigner

microsoft

References

1 reference

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

Impacted products

5 products

Vendor	Product	Version
Microsoft	Microsoft 365 Apps for Enterprise	Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
Microsoft	Microsoft Office 2019	Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (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 Word 2016	Affected: 16.0.1 , < 16.0.5552.1000 (custom)

Date Public ?

2026-05-12 14:00

Show details on NVD website

JSON

To clipboard

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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*",
                  "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases",
                  "versionStartIncluding": "16.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:word_2016:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.0.5552.1000",
                  "versionStartIncluding": "16.0.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-05-12T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "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",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-552",
              "description": "CWE-552: Files or Directories Accessible to External Parties",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-14T18:08:04.998Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Microsoft Word Information Disclosure Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35440"
        }
      ],
      "title": "Microsoft Word Information Disclosure Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-35440",
    "datePublished": "2026-05-12T16:58:36.387Z",
    "dateReserved": "2026-04-02T19:21:11.805Z",
    "dateUpdated": "2026-05-14T18:08:04.998Z",
    "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.

Action not permitted

MSRC_CVE-2026-35440

CVE-2026-35440 (GCVE-0-2026-35440)

Tags

Sightings

Nomenclature