A public SharePoint RCE vulnerability PoC is actively probed in the wild. Patch CVE-2026-63520 and CVE-2026-55040 now to protect your servers.
CVE-2026-55040
CISA added four exploited flaws to its KEV Catalog, hitting SharePoint, VMware vCenter, macOS, and Windows IKE. Patch by August 21.
Rapid7 published full details and a PoC for CVE-2026-55040, a critical SharePoint authentication bypass that forges JWT tokens. Patch now.