CISA Adds Four Exploited Vulnerabilities to KEV
CISA added four actively exploited vulnerabilities affecting Microsoft IKE, SharePoint, VMware vCenter, and macOS to its Known Exploited Vulnerabilities catalog.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 4 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-33824, CVE-2026-55040, CVE-2026-59310, and CVE-2026-65400 as exploited in the wild.
CISA has expanded its Known Exploited Vulnerabilities (KEV) Catalog with four new entries, each confirmed to be under active exploitation in the wild. The affected products span Microsoft's Internet Key Exchange (IKE) Service Extensions (a double-free vulnerability), Microsoft SharePoint (weak authentication), Broadcom VMware vCenter (path traversal), and Apple macOS (improper authentication). These products are widely deployed across enterprise and federal environments, making them attractive targets for opportunistic and targeted attackers alike.
Under Binding Operational Directive (BOD) 26-04, Federal Civilian Executive Branch agencies are required to remediate these vulnerabilities on a prioritized, risk-based schedule, particularly those enabling full asset compromise on internet-facing systems. The directive also mandates that agencies verify whether systems were compromised prior to patching. While the mandate applies only to federal agencies, CISA recommends all organizations using the affected Microsoft, VMware, and Apple products apply patches and review for indicators of prior compromise given confirmed in-the-wild exploitation.
No specific threat actors, malware families, or IOCs were disclosed in this advisory; it serves as a notification of catalog updates rather than an in-depth technical report. Organizations running SharePoint, vCenter, IKE-based VPN services, or macOS should treat these as high-priority patches given active exploitation status.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/alerts/2026/08/18/cisa-adds-four-known-exploited-vulnerabilities-catalog
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