CVE-2026-45659Vulnerability
Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability
Exploited in the wildCISA added it to its Known Exploited Vulnerabilities list on .
Reported by 2 independent sources · first reported by Recorded Future · last reported
Last reported 22 days ago
CISA KEVAdded 1 Jul 2026
Fix due 4 Jul 2026
Used by ransomware: knownCISA KEV catalogue
Fix due 4 Jul 2026
Used by ransomware: knownCISA KEV catalogue
EPSS2.7%
higher than 85% of CVEsFIRST EPSS, as of 23 Oct 2026
higher than 85% of CVEsFIRST EPSS, as of 23 Oct 2026
What the reports say
2 reports, newest first · the exact sentence from each-
Warlock Expands SharePoint Exploitation in Critical Infrastructure Attacks“In addition to ToolShell, its arsenal may also include recent flaws such as CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, CVE-2026-58644, CVE-2026-50522, and CVE-2026-55040.”
-
July 2026 CVE Landscape“CVE-2026-45659”
Indicators reported together
named in the same reportsAlso named with it: CVE-2026-50522, CVE-2026-58644, CVE-2026-56164, CVE-2025-49113, CVE-2026-33824, CVE-2024-42009, CVE-2026-15409, CVE-2026-15410, CVE-2026-25089, CVE-2026-39808, CVE-2026-42897, CVE-2026-32201, CVE-2025-55182, CVE-2018-0802, CVE-2025-3248, CVE-2008-4128, CVE-2017-17215, CVE-2021-4034, CVE-2021-27137, CVE-2023-4346
Thanks — we review every report.