Security
CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV
The Hacker News·July 17, 2026·1 min read
CISA added a newly patched Microsoft SharePoint Server flaw, CVE-2026-58644 (CVSS 9.8), to its Known Exploited Vulnerabilities catalog on Thursday. The critical deserialization vulnerability requires Federal Civilian Executive Branch agencies to apply fixes by July 19, 2026. The zero-day is actively exploited, prompting urgent action from U.S. cybersecurity authorities.
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