CVE-2026-55128 (GCVE-0-2026-55128)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:09 – Updated: 2026-07-14 19:41
VLAI
Title
Microsoft Word Remote Code Execution Vulnerability
Summary
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CWE
Assigner
References
Impacted products
Vendor Product Version
Microsoft Microsoft 365 Apps for Enterprise Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
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Microsoft Microsoft Office 2019 Affected: 19.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
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Microsoft Microsoft Office 365 for Mac Affected: 1.0.0 , < 16.111.26071215 (custom)
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Microsoft Microsoft Office LTSC 2021 Affected: 16.0.1 , < https://aka.ms/OfficeSecurityReleases (custom)
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Microsoft Microsoft Office LTSC 2024 Affected: 16.0.0 , < https://aka.ms/OfficeSecurityReleases (custom)
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Microsoft Microsoft Office LTSC for Mac 2021 Affected: 16.0.1 , < 16.111.26071215 (custom)
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Microsoft Microsoft Office LTSC for Mac 2024 Affected: 16.0.0 , < 16.111.26071215 (custom)
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Microsoft Microsoft SharePoint Enterprise Server 2016 Affected: 16.0.0 , < 16.0.5561.1001 (custom)
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Microsoft Microsoft SharePoint Server 2019 Affected: 16.0.0 , < 16.0.10417.20175 (custom)
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Microsoft Microsoft SharePoint Server Subscription Edition Affected: 16.0.0 , < 16.0.19725.20434 (custom)
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Microsoft Microsoft Word 2016 Affected: 16.0.1 , < 16.0.5561.1000 (custom)
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Date Public
2026-07-14 14:00
Show details on NVD website
To clipboard 

{
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      "descriptions": [
        {
          "lang": "en-US",
          "value": "Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally."
        }
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        }
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    "state": "PUBLISHED"
  },
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.