Summary
generated automatically from NVD dataCVE-2026-56164 affects Microsoft Office SharePoint Server, including the 2016 and 2019 releases. It is a missing authentication flaw for a critical function (CWE-306) that lets an unauthorized attacker elevate privileges over the network. The issue is listed in the CISA KEV catalog, which confirms active exploitation, and carries a CVSS v3.1 score of 5.3 (MEDIUM) with a low integrity impact.
NVD description
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-14. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-07-17
EPSS · FIRST.org
1.0%probability of exploitation in the next 30 days
Higher than 62% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 14 juil. 2026
- Updated
- 14 juil. 2026
- Status
- Analyzed
- Source
- secure@microsoft.com
Affected products
Weaknesses (CWE)
References (2)
Similar CVEs
Other vulnerabilities of type CWE-306
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