CISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.   CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability CVE-2026-55040 Microsoft SharePoint Weak Authentication Vulnerability CVE-2026-59310 Broadcom VMware vCenter Path Traversal Vulnerability   CVE-2026-65400 Apple macOS Improper Authentication Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize ...

Microsoft SharePoint contains a weak authentication vulnerability which allows an unauthorized attacker to bypass a security feature over a network.

Threat actors have begun exploiting a critical Microsoft SharePoint flaw following the release of proof-of-concept (PoC) exploit code by Rapid7. About CVE-2026-55040 Tracked as CVE-2026-55040, the vulnerability was patched by Microsoft as part of its July 2026 Patch Tuesday updates. “The authentication feature could be bypassed as this vulnerability allows impersonation,” Microsoft said. “Exploiting this vulnerability could allow an attacker to disclose files and modify data, but the attacker cannot impact the availability of the … More → The post Attackers exploit critical SharePoint flaw after PoC goes public (CVE-2026-55040) appeared first on Help Net Security .

Attackers are exploiting SharePoint flaw CVE-2026-55040 after a public PoC was released, allowing unauthenticated users to impersonate administrators. Attackers started exploiting CVE-2026-55040 (CVSS score of 9.1), a critical SharePoint authentication bypass patched in July, within days of Rapid7 releasing a public proof-of-concept on August 12. The vulnerability allows an unauthenticated attacker impersonate any SharePoint user […]

Threat actors have begun to exploit a newly disclosed Microsoft SharePoint vulnerability following the release of a proof-of-concept (PoC) code. The vulnerability in question is CVE-2026-55040 (CVSS score: 9.1), which refers to a critical security feature bypass that stems from weak authentication. It was patched by Microsoft as part of its July 2026 Patch Tuesday updates. "The authentication

Security researchers found a way to enter Microsoft SharePoint servers as any user, including an administrator, with no valid account. A significant part of the work that found it was done through an AI agent. The flaw, tracked as CVE-2026-55040 (CVSS 9.1), affects SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Server 2016. Microsoft's