CVE-2026-58639: Microsoft SharePoint Server Spoofing Vulnerability
Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
CSIRTS triage
- What
- Server-side request forgery in SharePoint allows an authorized attacker to perform spoofing.
- Who is affected
- SharePoint Server deployments where authorized users have upload or request capabilities.
- Urgency
- Medium; CVSS 6.5 requiring authentication; spoofing risk is lower severity than RCE.
- Action
- Apply the security patch for SharePoint Server from Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58639
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-586390.83% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-58639 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
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