Office PowerPoint: Use-after-free leads to remote code execution
Summary
A use-after-free flaw in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network. Exploitation requires a user to take an action, typically opening a malicious PowerPoint file received by email or download. The CVSS 3.1 base score is 8.8 (High). No exploitation is known at the time of writing.
Affected
- Microsoft 365 Apps for Enterprise (Windows, 32/64-bit): from 16.0.1, fixed build unknown
- Office 365 for Mac: from 1.0.0 before 16.115.26110837
- Office LTSC 2021 (32/64-bit): from 16.0.1 before 16.0.14334.21048
- Office LTSC 2024 (32/64-bit): from 16.0.0 before 16.0.17932.21140 (third-party mirror only, not confirmed by the CNA)
- Office LTSC for Mac 2021 and 2024: from 16.0.1 (2021) or 16.0.0 (2024) before 16.115.26110837 (LTSC 2024 per mirror only)
Fixed in
- Office 365 for Mac: 16.115.26110837
- Office LTSC 2021: 16.0.14334.21048
- Microsoft 365 Apps for Enterprise: Unknown, see the Microsoft Office security release information in the MSRC advisory
- Office LTSC 2024 and LTSC for Mac 2021: 16.0.17932.21140 and 16.115.26110837 according to a third-party mirror only, not yet confirmed
Workaround
Unknown. No vendor workaround was found in the sources reviewed.
- Keep Protected View enabled for files from the internet and email.
- Warn staff about unsolicited PowerPoint attachments and links.
Exploitation
- No known exploitation in the wild and no public proof of concept at the time of review.
- CVE record exploit maturity: Unproven (E:U). CISA SSVC: exploitation none, automatable no.
- CISA KEV status not verified.
Our recommendation
- Patch Microsoft 365 Apps and Office LTSC clients through the normal update channel as soon as possible.
- Verify installed build numbers after rollout against the MSRC advisory.
- Keep Protected View enabled and warn staff about unsolicited PowerPoint attachments and links.
- Review mail gateway and attachment filtering.
- Recheck the MSRC advisory and CISA KEV, as NVD analysis was still pending.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide (CVE-2026-112734) msrc.microsoft.com
- CVE.org CNA record (Microsoft) www.cve.org
- Strix mirror (version table, status) www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 10 Nov 2026, 22:54.
Original description (NVD)
Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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