CVE-2026-54108 Microsoft SharePoint Server Spoofing Vulnerability
An authorized attacker can exploit external control of file names or paths in Microsoft SharePoint to perform spoofing attacks over the network.
- 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-2026-54108?
CVE-2026-54108 is a medium-severity path traversal vulnerability in Microsoft Sharepoint Server, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
External control of file name or path in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Weakness: CWE-73
Which versions are affected by CVE-2026-54108?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2026-54108?
No fix has been published for CVE-2026-54108 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-54108 being exploited?
There is no known exploitation of CVE-2026-54108 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-hggf-8h2q-j24h.