EUVD-2026-73820
GHSA-24vf-r476-3g43
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network delivery of a crafted document requires victim interaction (UI:R); no attacker credentials needed (PR:N); impact is confidentiality-only from a read primitive (C:H/I:N/A:N).
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 enables remote attackers to disclose high-value in-process memory contents by convincing a user to open a specially crafted document. Affecting Microsoft 365 Apps for Enterprise, Word 2016, Office 2019/2021/2024 LTSC on Windows (x86/x64) and Office for Mac editions, this CWE-125 flaw requires no attacker authentication but does require victim interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target user to open a specially crafted Microsoft Word document using an affected Office installation - this is the sole prerequisite, confirmed by the UI:R CVSS metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 score (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) accurately reflects the real-world risk profile. … 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 the vendor-released patch via Microsoft Update or the Microsoft Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78503. … 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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