EUVD-2026-44199
GHSA-fw32-5jmc-676r
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File must be opened by the user so AV:L and UI:R; no auth needed (PR:N); code runs as the current user with full impact (C/I/A:H, S:U).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office Excel (Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, Office for Mac, Office Online Server) arises from an out-of-bounds read (CWE-125) that an attacker weaponizes by luring a victim into opening a crafted spreadsheet, yielding code execution in the user's security context. The flaw carries a CVSS 7.8 (AV:L/AC:L/PR:N/UI:R) and requires no privileges but does require user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a specially crafted Excel spreadsheet in an affected Office/Excel build (UI:R in the CVSS vector), and code runs only in the context of the user who opens the file (S:U). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a credible but user-interaction-gated risk rather than a wormable emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a finance employee a spreadsheet disguised as an invoice or report; when the victim opens it and dismisses or bypasses Protected View, Excel's parser performs an out-of-bounds read on the crafted content and the attacker gains code execution as that user. Because the attack is local and low-complexity but requires user interaction, it is delivered through phishing rather than remote network exploitation. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-55058 for your specific product and channel; Windows and Microsoft 365 Apps users should install the current monthly Office/Click-to-Run update, and Office LTSC and Office for Mac users should apply the corresponding platform update, with Office Online Server administrators patching the server per the same bulletin (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55058). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all deployments of affected Office products (Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, Office for Mac, and Office Online Server) and assess patch readiness across your environment. …
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Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and Office for Mac 2021/2024)
Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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