CVE-2026-45659

Radar advisories

• 2026-07-14 CISA CISA Urges SharePoint Hardening After New Exploitations Active exploitation of CVE-2026-32201, CVE-2026-45659, and CVE-2026-56164 is targeting on-premises SharePoint Server.
• 2026-07-01 CISA CISA KEV — Microsoft SharePoint Server (CVE-2026-45659) The advisory states that CVE-2026-45659 in Microsoft SharePoint Server is being actively exploited, involving deserialization of untrusted data.

Related analysis

• 2026-07-02 Cybersecurity The Control Plane Is the New Perimeter This week's advisories cluster in remote support, backup, storage, AI workflow and SharePoint systems - the control plane. A medium-severity bug there can matter more than a critical bug in something isolated. The perimeter has moved.

Named alongside

• CVE-2026-32201
• CVE-2026-41264
• CVE-2026-41940
• CVE-2026-48558
• CVE-2026-55040
• CVE-2026-56164
• CVE-2026-58644
• CVE-2026-7570
• CVE-2026-9787

References

• NVD ↗
• CVE.org ↗
• CISA KEV catalogue ↗ listed as known exploited