CISA Adds Five Actively Exploited Vulnerabilities to the KEV Catalog
CISA added five vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog based on evidence of active exploitation, reinforcing that these issues are being used as real-world attack vectors and should be prioritized for remediation. The newly listed CVEs are CVE-2018-14634 (Linux kernel integer overflow / local privilege escalation), CVE-2025-52691 (SmarterTools SmarterMail unrestricted file upload enabling RCE), CVE-2026-21509 (Microsoft Office security feature bypass), CVE-2026-23760 (SmarterTools SmarterMail authentication bypass via alternate path/channel), and CVE-2026-24061 (GNU InetUtils argument injection). CISA reiterated that these vulnerability classes are frequently leveraged by threat actors and pose material risk to enterprise environments.
Under BOD 22-01, U.S. Federal Civilian Executive Branch (FCEB) agencies are required to remediate KEV-listed vulnerabilities by CISA-specified due dates, and CISA urged all organizations to treat KEV entries as high-priority items in vulnerability management. Additional technical context highlighted that CVE-2025-52691 can enable unauthenticated arbitrary file upload leading to remote code execution (noted as CVSS 10.0 in the reporting) and that CVE-2018-14634, while older, remains relevant where legacy Linux kernels persist—underscoring that KEV additions can include long-standing flaws when exploitation is observed in the wild.
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