CVE-2026-64901: Microsoft SharePoint Server Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CSIRTS triage
- What
- Deserialization of untrusted data in Microsoft SharePoint Server allows an authorized attacker to execute code over a network.
- Who is affected
- Authorized users on SharePoint Server deployments, with network-based attack vector.
- Urgency
- High priority; CVSS 8.8 indicates severe risk and RCE capability over the network, though not currently exploited.
- Action
- Apply Microsoft security updates for SharePoint Server when available.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64901
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.
- Moderate exploitation riskCVE-2026-649011.9% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 78% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-64901 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
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