EUVD-2026-56569
GHSA-vwwc-p79j-c5jm
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Description confirms only information disclosure; I:H and A:H in official vector are unsubstantiated by the narrative, so assessed at N pending vendor clarification.
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
3DescriptionCVE.org
Improper input validation in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information locally.
AnalysisAI
PowerPoint's improper input validation (CWE-20) exposes local users to high-impact compromise when a maliciously crafted presentation file is opened, with the official CVSS vector asserting high confidentiality, integrity, and availability impact - a notable divergence from the description's characterization as information disclosure only. The attack requires no attacker privileges but mandates user interaction, fitting a phishing-and-open-file threat model. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be able to deliver a maliciously crafted PowerPoint file to a local user, and that user must open the file using a vulnerable version of Microsoft PowerPoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS score of 7.8 (High) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H presents a notable internal tension: the description characterizes this as an information disclosure vulnerability, yet the I:H (high integrity) and A:H (high availability) impacts suggest consequences well beyond simple data leakage - potentially including arbitrary code execution or significant process corruption. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious PowerPoint file embedding a specially structured element that triggers the input validation flaw when parsed by the PowerPoint rendering engine. The file is delivered to a target employee via phishing email or a compromised file-sharing link; upon opening the file, the flaw is triggered and sensitive information from the process memory or local filesystem may be disclosed - and given the I:H/A:H CVSS metrics, additional integrity or availability impacts may also occur beyond what the description explicitly states. … |
| Remediation | Consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70313 for the official patched version and deployment guidance. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Implement file-level controls by blocking PowerPoint files (.ppt, .pptx, .potx, .pps, .ppsx) from entering the organization via email gateways and external file transfer services, while notifying users of the restriction and expected duration. …
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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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