CVE-2026-88155 Microsoft Office SharePoint Remote Code Execution Vulnerability
An authorized attacker can execute arbitrary code remotely via a heap-based buffer overflow in Microsoft SharePoint Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88155?
CVE-2026-88155 is a high-severity memory corruption vulnerability in Microsoft Sharepoint Server, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Heap-based buffer overflow in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-88155?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2026-88155?
No fix has been published for CVE-2026-88155 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-88155 being exploited?
There is no known exploitation of CVE-2026-88155 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sharepoint Server
- CVE-2026-50522 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
- CVE-2026-58644 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2026-20963 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2025-53770 Microsoft SharePoint Deserialization of Untrusted Data
- CVE-2023-29357 Microsoft SharePoint Server Privilege Escalation
Sources
Also known as GHSA-77gw-4c87-g3xj.