CVE-2026-45659

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Scoring

• CVSS: 8.8 (HIGH, 3.1)
• EPSS exploitation probability: Not yet available
• EPSS percentile: Not yet available

CISA KEV status

• Added to KEV: 2026-07-01
• Remediation due date: 2026-07-04
• Known ransomware campaign use: Known

Weakness types (CWE)

• CWE-502

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45659

More from Microsoft

• CVE-2026-96951 — Windows
• CVE-2026-65660 — SharePoint
• CVE-2026-81963 — Windows
• CVE-2026-85880 — Windows
• CVE-2019-1068 — SQL Server