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PatchSiren cyber security CVE debrief

CVE-2026-78513 Microsoft CVE debrief

Microsoft Office PowerPoint is vulnerable to an out-of-bounds read, allowing local information disclosure. The CVE record was published on 2026-09-08T18:20:46.590Z and has not been modified since then. The NVD entry is currently Analyzed. This vulnerability affects Microsoft Office PowerPoint installations, which defenders should assess for exposure and prioritize patching for high-risk systems, considering the MEDIUM severity and potential for local information disclosure. The vulnerability has a CVSS score of 5.5.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-17
Advisory published
2026-09-08
Advisory updated
2026-09-17

Who should care

Defenders responsible for Microsoft Office PowerPoint installations should assess exposure and prioritize patching for high-risk systems, considering the MEDIUM severity and potential for local information disclosure. This assessment should include reviewing the CVE record and NVD entry for details on the vulnerability and its impact on Microsoft Office PowerPoint installations.

Why it matters

CVE-2026-78513 is a MEDIUM-severity vulnerability in Microsoft Office PowerPoint that allows local information disclosure. Defenders should assess exposure and prioritize patching for high-risk systems.

  • Local information disclosure possible
  • Patching required for high-risk systems

Technical summary

Microsoft Office PowerPoint is vulnerable to an out-of-bounds read, allowing local information disclosure. The vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity. This vulnerability affects Microsoft Office PowerPoint installations, and defenders should assess exposure and prioritize patching for high-risk systems. The vulnerability allows unauthorized attackers to disclose information locally.

Defensive priority

Assess exposure of Microsoft Office PowerPoint installations, prioritize patching for high-risk systems.

Recommended defensive actions

  • Assess exposure of Microsoft Office PowerPoint installations
  • Prioritize patching for high-risk systems
  • Verify patch deployment

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. Microsoft has released a patch for the vulnerability. The information available indicates that the vulnerability allows local information disclosure and has not been modified since its publication on 2026-09-08T18:20:46.590Z. Defenders should verify patch deployment and assess exposure of Microsoft Office PowerPoint installations. The NVD entry and CVE record are official sources for this information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78513 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78513

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-78513 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78513

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.