Home › CVE Intelligence › CVE-2026-58644
CVSS 9.8 CRITICAL 🔴 ACTIVELY EXPLOITED Zero-Day Exploit

CVE-2026-58644: CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a newly patched security flaw impacting Microsoft SharePoint Server to its Known Exploited Vulnerabilities (KEV) catalog, requiring Fede…

9.8CVSS Score
CRITICALSeverity
NOCISA KEV
1.3%EPSS Score
Zero-Day ExploitImpact Type

📋 Vulnerability Details

CVE IDCVE-2026-58644
VendorUnknown Vendor
Affected ProductUnknown Product
Vulnerability TypeZero-Day Exploit
CVSS Score9.8 (CRITICAL)
EPSS Score1.3% probability of exploitation in the next 30 days
Actively Exploited✅ Yes
Patch StatusPending Vendor Disclosure
Reported ByCYBERDUDEBIVASH SENTINEL APEX Intelligence (via sentinel_apex)

🔬 Technical Analysis

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a newly patched security flaw impacting Microsoft SharePoint Server to its Known Exploited Vulnerabilities (KEV) catalog, requiring Federal Civilian Executive Branch (FCEB) agencies to apply the fixes by July 19, 2026.

The vulnerability in question is CVE-2026-58644 (CVSS score: 9.8), a critical deserialization

🎯 Known Indicators of Compromise

{"type":"indicator","value":"CVE-2026-58644","confidence_score":23.5,"first_seen":"2026-07-17","source_count":1}
⚡ DETECTION RULES AVAILABLE

Get CVE-2026-58644 Detection Pack

Sigma rules, YARA signatures, IOC table, and SIEM queries for Splunk, Elastic, Sentinel, and Chronicle — deployable in 5 minutes.

✓ Sigma Rules ✓ YARA Pack ✓ IOC Table ✓ SIEM Queries
🛡️ Get Detection Pack → 🔌 Access via API →

🔗 Related Intelligence