EUVD-2026-56571
GHSA-r9qw-w4mc-xchp
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local file-based trigger (AV:L) with mandatory user open action (UI:R); no target-system privileges required from attacker (PR:N); impact is confidentiality-only with no integrity or availability effect.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionNVD
Improper input validation in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information locally.
AnalysisAI
Improper input validation in Microsoft Office PowerPoint enables local information disclosure when a victim opens a specially crafted presentation file. The vulnerability spans Microsoft 365 Apps for Enterprise, Office LTSC 2021 and 2024, Office 2019, and their macOS counterparts across both subscription and perpetual-license release tracks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a specially crafted PowerPoint file on a system running an affected Office version (UI:R explicitly confirmed by CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 Medium score reflects an attack constrained by local execution (AV:L) and mandatory user interaction (UI:R), materially limiting opportunistic or automated mass exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious PowerPoint file (.pptx or .ppt) engineered to trigger the improper input validation flaw and delivers it to a target via spear-phishing email or a compromised file share. When the victim opens the file, the parser processes the malformed input structure and exposes sensitive memory contents or local file data - potentially credentials, document fragments, or other confidential information resident in process memory at parse time - back to the attacker. … |
| Remediation | Apply Microsoft's security update through the standard Office update mechanism for your release track. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Information Disclosure
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External POC / Exploit Code
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