Summary
generated automatically from NVD dataCVE-2026-58644 is a deserialization of untrusted data flaw (CWE-502) in Microsoft Office SharePoint Server, affecting versions including 2016 and 2019. An unauthorized attacker can exploit it over a network to execute arbitrary code, with no privileges or user interaction required. It is rated CRITICAL with a CVSS v3.1 score of 9.8, and it is listed in the CISA KEV catalog, which means it is actively exploited.
NVD description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-16. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-07-19
EPSS · FIRST.org
15.9%probability of exploitation in the next 30 days
Higher than 96% 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 2026-10-18, 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
- 17 juil. 2026
- Status
- Analyzed
- Source
- secure@microsoft.com
Affected products
Weaknesses (CWE)
References (2)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644PatchVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644US Government Resource
Similar CVEs
Other vulnerabilities of type CWE-502
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