CVE-2026-58639 Microsoft SharePoint Server Spoofing Vulnerability
An authorized attacker can exploit Server-Side Request Forgery in 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-2026-58639?
CVE-2026-58639 is a medium-severity server-side request forgery vulnerability in Microsoft Sharepoint Server, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Weakness: CWE-918
Which versions are affected by CVE-2026-58639?
It affects 1 product.
Products include Microsoft Sharepoint Server.
How do I fix CVE-2026-58639?
No fix has been published for CVE-2026-58639 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-58639 being exploited?
There is no known exploitation of CVE-2026-58639 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-ph9c-74mv-vfx2.