EUVD-2026-56577
GHSA-3656-cj7q-mf85
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local file-open trigger (AV:L, UI:R), no prior privileges needed (PR:N), purely confidentiality impact 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
Information disclosure in Microsoft Office PowerPoint enables a local attacker to obtain sensitive data from a victim's system by exploiting improper input validation (CWE-20) when processing a malicious file. Affected products span Windows and Mac editions including Office 2019, Microsoft 365 Apps for Enterprise, LTSC 2021/2024, and Office 365 for Mac - all requiring the victim to open a crafted PowerPoint file (UI:R). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:L/PR:N/UI:R) confirms the following concrete prerequisites: the victim must actively open a malicious PowerPoint file on their local machine (UI:R), but the attacker requires no prior privileges or authentication on the target system (PR:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 (Medium) reflects a bounded threat profile: the attack vector is local (AV:L), user interaction is required (UI:R), and the impact is purely informational (C:H with I:N/A:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious PowerPoint file embedding specially formed input designed to bypass validation logic and trigger a memory or data read outside intended boundaries. The file is delivered to a target employee via a phishing email or shared storage, and upon opening the document in an unpatched version of PowerPoint, sensitive data accessible to the process - such as memory contents, local file fragments, or credential material - is disclosed back to the attacker through the document or a side-channel. … |
| Remediation | Apply the vendor-released patch immediately. … 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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