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PatchSiren cyber security CVE debrief

CVE-2026-108455 Microsoft CVE debrief

Microsoft Office PowerPoint vulnerability allows unauthorized information disclosure over a network due to an out-of-bounds read issue. This MEDIUM-severity vulnerability, with a CVSS score of 6.5, requires defenders to assess exposure and prioritize mitigation in Microsoft Office PowerPoint installations. The vulnerability's impact includes potential information disclosure over the network, necessitating verification of Microsoft Office PowerPoint installations and potential mitigation. Defenders should prioritize verifying and mitigating this vulnerability.

Vendor
Microsoft
Product
Microsoft 365 Apps for Enterprise
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-15
Original CVE updated
2026-10-16
Advisory published
2026-10-15
Advisory updated
2026-10-16

Who should care

Defenders responsible for Microsoft Office PowerPoint installations, network administrators, and security teams should assess exposure and prioritize mitigation.

Why it matters

CVE-2026-108455 is a MEDIUM-severity vulnerability in Microsoft Office PowerPoint that allows unauthorized information disclosure over a network. Defenders should prioritize verifying and mitigating this vulnerability in Microsoft Office PowerPoint installations.

  • Potential information disclosure over the network.
  • Requires verification of Microsoft Office PowerPoint installations and potential mitigation.

Technical summary

The CVE-2026-108455 vulnerability in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network due to an out-of-bounds read issue. The CVSS score is 6.5 with a MEDIUM severity rating. This vulnerability requires defenders to verify and mitigate in Microsoft Office PowerPoint installations, focusing on potential information disclosure over the network and necessary updates or mitigations.

Defensive priority

Defenders should prioritize verifying and mitigating this vulnerability in Microsoft Office PowerPoint installations.

Recommended defensive actions

  • Verify and apply Microsoft Office PowerPoint updates to mitigate the vulnerability.
  • Monitor network traffic for potential exploitation attempts.
  • Restrict access to sensitive information and systems.

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with a CVSS score of 6.5 and a MEDIUM severity rating. The CVE record was published on 2026-10-15T21:17:11.267Z and has not been modified since then. The official CVE Program record and NVD detail page offer source-provided CVE metadata and source-specific vulnerability assessment. However, additional verification tasks are required to confirm affected scope, severity, and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-108455 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-108455

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

  • CVE-2026-108455 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-108455

    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.