CVE-2026-88178 Microsoft Office PowerPoint Remote Code Execution Vulnerability
An attacker can execute arbitrary code remotely by exploiting a use-after-free flaw in Microsoft Office PowerPoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88178?
CVE-2026-88178 is a critical use after free vulnerability in Microsoft 365 Apps, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.
Weakness: CWE-416
Which versions are affected by CVE-2026-88178?
It affects 4 products.
Products include Microsoft 365 Apps, Microsoft Microsoft 365, Microsoft Office 2021, Microsoft Office 2024.
How do I fix CVE-2026-88178?
No fix has been published for CVE-2026-88178 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-88178 being exploited?
There is no known exploitation of CVE-2026-88178 in the wild and no public exploit code.
Other vulnerabilities in Microsoft 365 Apps
- CVE-2024-21413 Microsoft Outlook Improper Input Validation
- CVE-2023-23397 Microsoft Office Outlook Privilege Escalation
- CVE-2024-38189 Microsoft Project Remote Code Execution Vulnerability
- CVE-2023-35311 Microsoft Outlook Security Feature Bypass
- CVE-2026-21514 Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision
Sources
Also known as GHSA-cm9h-wc7c-f2hr.