Summary
generated automatically from NVD dataCVE-2026-45659 affects Microsoft Office SharePoint Server and stems from deserialization of untrusted data (CWE-502). An authorized attacker with low privileges can exploit it over the network to execute arbitrary code, with no user interaction required. It carries a CVSS v3.1 score of 8.8 (HIGH), and CISA's KEV catalog lists it as exploited, with known use in ransomware campaigns.
NVD description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-01. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-07-04
Used in known ransomware campaigns.
EPSS · FIRST.org
2.7%probability of exploitation in the next 30 days
Higher than 85% 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 2026-10-19, 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
- 22 mai 2026
- Updated
- 23 juil. 2026
- Status
- Analyzed
- Source
- secure@microsoft.com
Affected products
Weaknesses (CWE)
References (2)
Similar CVEs
Other vulnerabilities of type CWE-502
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