EUVD-2026-73826
GHSA-66c8-gx94-83f2
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network delivery of malicious document requires no attacker auth; victim must open file (UI:R); only confidentiality impact via memory read, consistent with CWE-125 read-class flaw.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Out-of-bounds read in Microsoft Office Word's document parser allows a remote unauthenticated attacker to disclose sensitive memory contents when a victim opens a crafted Word file. Affecting Word 2016, Office 2019/2021/2024 LTSC, and Microsoft 365 Apps for Enterprise across both x86 and x64 builds, the vulnerability carries a CVSS 6.5 with C:H but no integrity or availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The sole prerequisite is that the target user actively opens a crafted Word document (UI:R enforced by CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) accurately reflects the threat model: network-delivered, low-complexity, but gated on victim interaction and limited to confidentiality loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's vendor-released patch by updating to the following minimum build versions: Word 2016 to 16.0.5569.1000 or later, Office 2019 to 16.0.10417.20207 or later, Office LTSC 2021 to 16.0.14334.20896 or later, Office LTSC 2024 to 16.0.17932.20960 or later, and Microsoft 365 Apps for Enterprise to 16.0.20326.20138 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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